Bro , I have extracted the firmware straight from Flash chip, which contains my mac address & factory calibration data too, I can strip out the last 256 KB of data & will provide you the remaining firmware.
You have to find out the way to write your own mac address & serial No. in that last 256KB partition. Otherwise our mac will be cloned or may be possible that it won't work on your device.
If you messed up with your factory calibration data then, This router comes with 3 year warranty, you can go for replacement.