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Forums » Equipment Support » Hardware By Brand » D-Link » [Info] Flush out the NVRAM Before you Re-Flash Your Router Updat
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tipstir

join:2004-11-14
Enfield, CT
·Cox HSI


3 edits

[Info] Flush out the NVRAM Before you Re-Flash Your Router Updat

WARNING*** DO NOT FLASH OVER WIRELESS OR IN A LIGHTING STORM
YOU DO NOT WANT TO LOOSE POWER DURING THE NEXT STEPS
PLEASE TAKE YOUR TIME DOING THE BELOW STEPS
NO RUSH OKAY!
GOOD LUCK!


Step A_
First backup your config file
Take the router off your network
Just keep the power plug in it..
Now you'll need pin or paper clip for the reset button
This reset button need to be press in for 90 secs
During each 30 secs you'll be doing:

Step B_
press reset for 30 sec on the first try
press reset for 30 sec and unplug the power cord at the same time
press reset for 30 sec and plug-in the power cord at the same time
now unplug the unit wait 30 seconds
now plug in the power

Step C_
connect 1 LAN port cable back to the router
login as the admin
now re-flash
wait until the screen is completed
now unplug the unit wait 30 seconds

Step D_
Now repeat these steps..
press reset for 30 sec on the final try
reset 30 and unplug the power cord at the same time
press reset for 30 sec and plug-in the power cord at the same time
now unplug the unit wait 30 seconds
now plug in the power

Step E_
connect all LAN/WAN cables back to the router
login as the admin
either you recover from a backup or just start fresh.
KGB7

join:2003-12-17
Rockville, MD

Re: [Info] Flush out the NVRAM Before you Re-Flash Your Router U

Make it Sticky!
deminicus

join:2003-01-09
Norristown, PA
Hey mind sharing some more info on this. I am curious to know why and when this should be done as opposed to just flashing the new firmware.

thx
Reinvent3d

join:2004-12-06
Camarillo, CA

Re: [Info] Flush out the NVRAM Before you Re-Flash Your Router U

IMHO, should be done before and after flashing of new firmware. Or even just setting it up. It's just a way to make sure no settings get corrupted. I will have to say that if you do this, do NOT restore stuff up from a backup, unless you are backing settings up onto the same firmware version. If not, set it up from scratch.
KGB7

join:2003-12-17
Rockville, MD

Re: [Info] Flush out the NVRAM Before you Re-Flash Your Router U

You can also do this once a month as maintenance routine to keep your router working at its peek performance.

tipstir

join:2004-11-14
Enfield, CT
·Cox HSI


1 edit

Re: [Info] Flush out the NVRAM Before you Re-Flash Your Router U

Actually you should all put the wireless router, cable modem, switches, wireless access points, print servers on timers to shutdown at night where your sleeping. This way it can cool off thus save energy too. My cable modem works very hard I also reset that one flush out the NVRAM once every 6 months. After that it performs faster.

I control everything with one power surge strip, I should put everything on a timer. Flush out all the switches too. Say like 4am to 9am (5 hrs) shutdown.

Again the above is good when you have flashed the router so many times with different firmware. I just do this to make sure all the crap in NVRAM is gone. I didn't do it last time could explain why the N wasn't working. I'll do it with 1.31 firmware. It's a lot of work to bring down the network.

FrostyMelon

join:2006-02-06
Colorado Springs, CO

Re: [Info] Flush out the NVRAM Before you Re-Flash Your Router U

gigaenvy

join:2009-05-02
This sounds extreme and excessive.

tipstir

join:2004-11-14
Enfield, CT
·Cox HSI

Re: [Info] Flush out the NVRAM Before you Re-Flash Your Router U

said by gigaenvy See Profile :

This sounds extreme and excessive.
Quite safe.. I've done it many times..
Bourbon

join:2007-12-24
Guntown, MS

Re: [Info] Flush out the NVRAM Before you Re-Flash Your Router U

Tipstir, can you explain exactly what this does? How is it different from resetting the router to factory defaults (or something similar)? Also, what do you think would be the number of different firmware flashes to require the need for this method?

Thanks.

tipstir

join:2004-11-14
Enfield, CT
·Cox HSI

Re: [Info] Flush out the NVRAM Before you Re-Flash Your Router U

said by Bourbon See Profile :

Tipstir, can you explain exactly what this does? How is it different from resetting the router to factory defaults (or something similar)? Also, what do you think would be the number of different firmware flashes to require the need for this method?

Thanks.
Clears out the NVRAM, if you installed prior many prior firmware you want to make sure you got rig any older code left over from the prior firmware. So you want to start off fresh!

aaronwt
Premium
join:2004-11-07
Woodbridge, VA
·Verizon FIOS


4 edits
said by tipstir See Profile :

Actually you should all put the wireless router, cable modem, switches, wireless access points, print servers on timers to shutdown at night where your sleeping. This way it can cool off thus save energy too. My cable modem works very hard I also reset that one flush out the NVRAM once every 6 months. After that it performs faster.

I control everything with one power surge strip, I should put everything on a timer. Flush out all the switches too. Say like 4am to 9am (5 hrs) shutdown..........

I have ten DLINk Gigabit switches, a Dlink access point, a couple of Dlink Bridges, a DGL4500, and the Actiontec router. they are never turned off. All my electronics are on a UPS. All of the network equipment is covered for 15 to 20 hours during a power outage. I never turn them off and never reboot unless necessary like during a firmware upgrade or to get a new IP address. Otherwise I have no other reason to reboot.
I would never turn that equipment off, since I have around 50 devices on my network and there is always a device that needs internet access at any given moment, especially my alarm system.

tipstir

join:2004-11-14
Enfield, CT
·Cox HSI

Re: [Info] Flush out the NVRAM Before you Re-Flash Your Router U

said by aaronwt See Profile :

said by tipstir See Profile :

Actually you should all put the wireless router, cable modem, switches, wireless access points, print servers on timers to shutdown at night where your sleeping. This way it can cool off thus save energy too. My cable modem works very hard I also reset that one flush out the NVRAM once every 6 months. After that it performs faster.

I control everything with one power surge strip, I should put everything on a timer. Flush out all the switches too. Say like 4am to 9am (5 hrs) shutdown..........

I have ten DLINk Gigabit switches, a Dlink access point, a couple of Dlink Bridges, a DGL4500, and the Actiontec router. they are never turned off. All my electronics are on a UPS. All of the network equipment is covered for 15 to 20 hours during a power outage. I never turn them off and never reboot unless necessary like during a firmware upgrade or to get a new IP address. Otherwise I have no other reason to reboot.
I would never turn that equipment off, since I have around 50 devices on my network and there is always a device that needs internet access at any given moment, especially my alarm system.
Well everyone going to have different setup. You're running SBS right or small domain, average home using not going to be running such a complex system. I mean I come close to you in switches. I really don't need more than 20+ nodes. on Enterprise Server. Don't have to turn off everything that's optional to save energy. I have wireless set to shut down after 3am to 7am no need to have that running where not one is up using it.
Neblinio

join:2008-07-24
spain

I think your step B is a little confusing. I looked around and found these steps, which in my opinion are clearer and easier to follow:

1. when the unit is powered on, hold down its reset button for 30 seconds
2. while still holding down the reset button, unplug the router from power and hold for an additional 30 seconds
3. still holding down the reset button, turn on power to the router again and hold for 30 more seconds

»compnetworking.about.com/b/2009/···ters.htm

tipstir

join:2004-11-14
Enfield, CT
·Cox HSI

Re: [Info] Flush out the NVRAM Before you Re-Flash Your Router U

said by Neblinio See Profile :

I think your step B is a little confusing. I looked around and found these steps, which in my opinion are clearer and easier to follow:

1. when the unit is powered on, hold down its reset button for 30 seconds
2. while still holding down the reset button, unplug the router from power and hold for an additional 30 seconds
3. still holding down the reset button, turn on power to the router again and hold for 30 more seconds

»compnetworking.about.com/b/2009/···ters.htm
1. press the reset for 30 seconds
2. unplug the power while keeping the reset press for 30 secs

Not that hard to do.. It's the unplugging of the power then plugging in the power is what makes it confusing.. Just can't let go of the rest button while your doing the un-pluging and re-pluging

No_Strings
Premium,Mod
join:2001-11-22
The OC

Host:
Wireless Networking
All Things Unix
Cox HSI
Qwest
Efficient

Re: [Info] Flush out the NVRAM Before you Re-Flash Your Router U

said by tipstir See Profile :

Just can't let go of the rest button while your doing the un-pluging and re-pluging
That's silly. If there's no power to the unit, you can hold the button, not hold the button or stand on your head and wiggle your ears and it won't make one damned bit of difference.

I think this whole thing is more superstition and rumor than science. Resetting a router to defaults after a firmware upgrade is a good practice. Re-loading an old configuration can be problematic if the newer firmware contains features not anticipated by the previous configuration. Any manufacturer worth their salt will call this out in the release notes and advise when to reconfigure from scratch. The rest makes no sense to me.

If I'm wrong and all of this folderal is needed to make a D-Link work properly, I'd be shopping for a different router.

tipstir

join:2004-11-14
Enfield, CT
·Cox HSI


1 edit

Re: [Info] Flush out the NVRAM Before you Re-Flash Your Router U

said by No_Strings See Profile :

said by tipstir See Profile :

Just can't let go of the rest button while your doing the un-pluging and re-pluging
That's silly. If there's no power to the unit, you can hold the button, not hold the button or stand on your head and wiggle your ears and it won't make one damned bit of difference.

I think this whole thing is more superstition and rumor than science. Resetting a router to defaults after a firmware upgrade is a good practice. Re-loading an old configuration can be problematic if the newer firmware contains features not anticipated by the previous configuration. Any manufacturer worth their salt will call this out in the release notes and advise when to reconfigure from scratch. The rest makes no sense to me.

If I'm wrong and all of this folderal is needed to make a D-Link work properly, I'd be shopping for a different router.
Power cord is plug - in
Press reset for 30 seconds
Unplug the power cord
Keep on pressing reset for another 30 seconds
Plug in power cord
Keep on pressing reset for another 30 seconds
Now Flash the unit

Repeat

Power cord is plug - in
Press reset for 30 seconds
Unplug the power cord
Keep on pressing reset for another 30 seconds
Plug in power cord
Keep on pressing reset for another 30 seconds
Quit

No_Strings
Premium,Mod
join:2001-11-22
The OC

Re: [Info] Flush out the NVRAM Before you Re-Flash Your Router U

Flash with new firmware.
Hold reset button for 10 seconds.
Done.
KGB7

join:2003-12-17
Rockville, MD

Re: [Info] Flush out the NVRAM Before you Re-Flash Your Router U

Drink two beers and slap your wife on the ass.

Now you are done!


tipstir

join:2004-11-14
Enfield, CT
·Cox HSI


4 edits
said by No_Strings See Profile :

Flash with new firmware.
Hold reset button for 10 seconds.
Done.
The way I did was in the first post.. I didn't have any issues. Actually all my routers I do the same method.

There is a Recovery WebSite Flash Mode (Recovery Boot) or Recovery Emergency! Note You'll need to set your computer to the same subnet mask. Now you'll be given a page that will only allow you to upload the firmware. Upload your bin file and let the router do it's thing and you're set!

This is different way:

1. so the browser needs to be up and running.
2. Set browser to 192.168.0.1 (hard coded ip recovery)
3. LAN port 1 to PC LAN card connected
4. disconnect power
5. hold reset
6. connect power
7. hold reset for at least 30-40 seconds
8. connect to web browser 192.168.0.1

No_Strings
Premium,Mod
join:2001-11-22
The OC

Re: [Info] Flush out the NVRAM Before you Re-Flash Your Router U

That, I'll buy. The rest is excessive.

tipstir

join:2004-11-14
Enfield, CT
·Cox HSI

Re: [Info] Flush out the NVRAM Before you Re-Flash Your Router U

said by No_Strings See Profile :

That, I'll buy. The rest is excessive.
Well the Recovery one I wouldn't use that unless it was the last resort or you had issues flashing the firmware (Example (router rebooting on it's own, stuff like that). The first post comes in handy for all of those here with A1, A2, A3 hardware who's be flashing back and forth with no many new flash releases. Some firmware sticks around and doesn't clear it self. I see DLINK is recommending resting the router after the you flash. I do it before and after.

Internet Expert

@comcast.net

Re: [Info] Flush out the NVRAM Before you Re-Flash Your Router U

THis is basically the worst thing Ive ever heard of doing. It is all redundant, makes no technical sense, and there are no good reasons for doing this. I think its a really bad idea for anyone to listen to this guy...

tipstir

join:2004-11-14
Enfield, CT
·Cox HSI

Re: [Info] Flush out the NVRAM Before you Re-Flash Your Router U

said by Internet Expert :

THis is basically the worst thing Ive ever heard of doing. It is all redundant, makes no technical sense, and there are no good reasons for doing this. I think its a really bad idea for anyone to listen to this guy...
It's not the worst thing.. I've you tired it? Others have.
taytong888

join:2005-06-20
Nepean, ON
Hello tipstir,

Does this Recovery Mode procedure work for reviving a bricked Asus WL-520GU router that previously was flashed with DD-WRT firmware? Or do I need to follow specific instructions in the DD-WRT web page?

tipstir

join:2004-11-14
Enfield, CT
·Cox HSI

Re: [Info] Flush out the NVRAM Before you Re-Flash Your Router U

said by taytong888 See Profile :

Hello tipstir,

Does this Recovery Mode procedure work for reviving a bricked Asus WL-520GU router that previously was flashed with DD-WRT firmware? Or do I need to follow specific instructions in the DD-WRT web page?
Browser set to the default IP use when you first got the router. Reset the router press in the pin in the rear for 40 seconds then release and keep on access the default IP through the browser. Has to be timed just right. Once you get in flash the router back with the orginal one. I did on the trendnet it worked.

How did you brick your Asus?
taytong888

join:2005-06-20
Nepean, ON

Re: [Info] Flush out the NVRAM Before you Re-Flash Your Router U

Thanks tipstir, I will give this a try. As for how I bricked the Asus router, when I first flashed the router I must have been too impatient to do the 30-30-30 properly. Then I spent a few hours playing with the reset button and got it working as a non-DD-WRT router. After that I flashed the DD-WRT firmware and it was working fine. Recently I switched to the modified Trendnet and had to unplug the Asus. When I tried the Asus again, all lights went on despite no cables being plugged in. That's why I believe it has been bricked and asked you for the correct procedure to "unbrick" it. Hopefully this time I will work more slowly but correctly. Sorry for the long explanation.

Tools

@chello.nl
I've found that the standard procedure clears the NVRAM quite nicely. You can also burn some candles and do a raindance for 90secs......

aaronwt
Premium
join:2004-11-07
Woodbridge, VA
·Verizon FIOS

never update the firmware on ANY device without having it plugged into a UPS.

said by tipstir See Profile :

WARNING*** DO NOT FLASH OVER WIRELESS OR IN A LIGHTING STORM
YOU DO NOT WANT TO LOOSE POWER DURING THE NEXT STEPS
PLEASE TAKE YOUR TIME DOING THE BELOW STEPS
NO RUSH OKAY!
GOOD LUCK!


Step A_
First backup your config file
Take the router off your network
Just keep the power plug in it..
Now you'll need pin or paper clip for the reset button
This reset button need to be press in for 90 secs
During each 30 secs you'll be doing:

Step B_
press reset for 30 sec on the first try
press reset for 30 sec and unplug the power cord at the same time
press reset for 30 sec and plug-in the power cord at the same time
now unplug the unit wait 30 seconds
now plug in the power

Step C_
connect 1 LAN port cable back to the router
login as the admin
now re-flash
wait until the screen is completed
now unplug the unit wait 30 seconds

Step D_
Now repeat these steps..
press reset for 30 sec on the final try
reset 30 and unplug the power cord at the same time
press reset for 30 sec and plug-in the power cord at the same time
now unplug the unit wait 30 seconds
now plug in the power

Step E_
connect all LAN/WAN cables back to the router
login as the admin
either you recover from a backup or just start fresh.

Weird Science

@comcast.net

Your advice is wildly excessive and silly.

D-Link cautions to upgrade firmware with a wired connection, and advises that firmware upgrades can reset router configuration to default. You did not discover this.

No reason to make this a sticky. Your procedures are ill-informed.
Vihsadas

join:2003-12-08
Montreal, QC

Re: [Info] Flush out the NVRAM Before you Re-Flash Your Router U

This procedure doesn't make any technical sense to me. When the router's caps have been discharged after being unplugged for a while, it doesn't matter what you do with the reset button. What's with all of this reset button voodoo?

The emergency recovery page is a real thing, as I've seen that page, but other than that, just flash as D-link recommends...

tipstir

join:2004-11-14
Enfield, CT
·Cox HSI

Re: [Info] Flush out the NVRAM Before you Re-Flash Your Router U

said by Vihsadas See Profile :

This procedure doesn't make any technical sense to me. When the router's caps have been discharged after being unplugged for a while, it doesn't matter what you do with the reset button. What's with all of this reset button voodoo?

The emergency recovery page is a real thing, as I've seen that page, but other than that, just flash as D-link recommends...
Don't know why you think it doesn't make much sense. Known fact to clear/flush out the NVRAM after so many firmware updates and downgrades. If you just got A4 and don't have A1, A2, A3 then it might not make sense to you.
MLGTWISTED

join:2007-01-19
Melville, NY

Re: [Info] Flush out the NVRAM Before you Re-Flash Your Router U

I'm joining this really late, but what exactly does flushing out the NVRAM do and what is NVRAM? Im assuming it to be similar to cache-ing or cached information stored on the router, and it to just cleares it right?

tipstir

join:2004-11-14
Enfield, CT
·Cox HSI

Re: [Info] Flush out the NVRAM Before you Re-Flash Your Router U

said by MLGTWISTED See Profile :

I'm joining this really late, but what exactly does flushing out the NVRAM do and what is NVRAM? Im assuming it to be similar to cache-ing or cached information stored on the router, and it to just cleares it right?
Flushing out old code that tend to stick around after so many firmware updates and downgrades. Not going to hurt the router. I've tested it on every brand so far and no issues. Just take your time doing it.

mb

join:2000-07-23
Washington, NJ
·Comcast
·Callcentric
·Vonage
·Verizon Online DSL

said by MLGTWISTED See Profile :

I'm joining this really late, but what exactly does flushing out the NVRAM do and what is NVRAM? Im assuming it to be similar to cache-ing or cached information stored on the router, and it to just cleares it right?
NVRAM is non-volatile random access memory. Fancy words, but it is just memory that doesn't lose it's information when the power is turned off. Going through all such gyrations is absolutely not necessary UNLESS the firmware has been corrupted and needs to be re-flashed. It is unlikely that the device would run at all if the firmware was corrupted.
--
"When will they ever learn? When will they ever learn?"
Pete Seeger 1961


tipstir

join:2004-11-14
Enfield, CT
·Cox HSI

Re: [Info] Flush out the NVRAM Before you Re-Flash Your Router U

said by mb See Profile :

said by MLGTWISTED See Profile :

I'm joining this really late, but what exactly does flushing out the NVRAM do and what is NVRAM? Im assuming it to be similar to cache-ing or cached information stored on the router, and it to just cleares it right?
NVRAM is non-volatile random access memory. Fancy words, but it is just memory that doesn't lose it's information when the power is turned off. Going through all such gyrations is absolutely not necessary UNLESS the firmware has been corrupted and needs to be re-flashed. It is unlikely that the device would run at all if the firmware was corrupted.
It works and doesn't harm the router. All brands it works on. I've tested go figure.
ibsteve2u

join:2007-03-01
united state

Just a note:

Memory of any sort that will not accept a write, or memory of any sort that corrupts a write or a read sufficiently to cause a jump to a memory location that is not the intended target - whether it is a memory location that is not written by a firmware flash and so might contain "old code" or just the wrong location in successfully flashed memory - is by definition bad memory, and no amount of wishful thinking, voodoo, or power cycling is going to make it good memory.

tipstir

join:2004-11-14
Enfield, CT
·Cox HSI

Re: [Info] Flush out the NVRAM Before you Re-Flash Your Router U

said by ibsteve2u See Profile :

Just a note:

Memory of any sort that will not accept a write, or memory of any sort that corrupts a write or a read sufficiently to cause a jump to a memory location that is not the intended target - whether it is a memory location that is not written by a firmware flash and so might contain "old code" or just the wrong location in successfully flashed memory - is by definition bad memory, and no amount of wishful thinking, voodoo, or power cycling is going to make it good memory.
Code can get corrupt in memory flashing out the the old code thus results in a clear area for the firmware to run. You can believe it or not, but routers manufacturers are adapting is process now, DLINK and etc.
Slides

join:2001-09-02
Avenel, NJ
I'm amazed that this thread is stickied. The OP has failed to give any valid technical reason for this reset button voodoo. A simple reset is enough.

No_Strings
Premium,Mod
join:2001-11-22
The OC

Host:
Wireless Networking
All Things Unix
Cox HSI
Qwest
Efficient

Re: [Info] Flush out the NVRAM Before you Re-Flash Your Router U

said by Slides See Profile :

I'm amazed that this thread is stickied.
For one reason: It contains a valid reset procedure, including a variation helpful if firmware is corrupted.

The rest, I'll leave to the astute members to opine.
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