Problem: Radios are not available when flashing back to Netgear FW:
Solution: Netgear partition needs to be cleaned using command:

mtd erase netgear

This command must be executed on a console after you flashed back to netgear fw.
You should be able to enabled telnet via: http://192.168.1.1/debug.htm
Alternatively you can run this command in a serial console, in case you have a USB-TTL adapter connected.