I recommend that you do not try any 4200 Firmware as there are 3 hardware version revisions on the 4200 internals and the SBC 4100 is known as incompatible. You would either just get errors with no upgrade possible or it may just brick the modem where you can't use it at all. -- What’s the point of owning a supercar if you can’t scare yourself stupid from time to time?
