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The following steps discuss updating the firmware. If your router is a wireless version of the router, you should only update the firmware using a Ethernet cable connection.
Of course, you should first double-check that your firmware version is correct for your router's model and hardware version. The hardware version is listed on a sticker attached to the bottom of the router.
In the above example, note that the hardware (H/W) version is B2. Generally, any firmware designed for "Rev B" of the device can be applied, unless there is a specific direction on the D-Link site concerning a specific step-release (example: B2).
Note: Some firmware versions contain features designed and tested appropriate to the local geography's ISP specifications and laws. If you are having problems, and you have a firmware from another geography, apply the latest firmware from your own geography to see if it resolves your issue. D-Link may be reluctant to support your use of a firmware not designed and tested for your geography.
Step 2 (if needed):
Simply try again. Sometimes the file transfer fails.
Step 3 (if needed):
If you are using the correct firmware for your router, and you are still receiving an error indicating that the firmware is an incorrect version, you should follow these steps:
1. In your router's web configuration, navigate to Tools / System
2. Click on "Restore to Factory Default"
(Note: To continue beyond this point, you may need to adjust your computer to match the default settings. The router's IP address is 192.168.0.1, and the admin password is blank.)
3. Disconnect power from the router for a few moments, then reconnect it
4. Repeat your attempt to update the firmware
Step 4 (if needed):
If you continue to receive the error, follow the steps included in this FAQ answer:
Hint: After applying a new firmware, it is a recommendation of many Broadband Reports users that you reconfigure your router manually instead of using the "Load Settings From Local Hard Drive" feature found on Tools / Status.