Reversing embedded systems

[rcer]

Hi, this is a little bit off topic/forum, but I didn't know exactly to post this.

Does anybody know any good reversing forums specialized in hacking/reverse engineering embedded systems.

Reason for asking is that I have a controller board, containing an Atmega 1280 MCU, which is bricked. I would like to extract the firmware from the MCU flash, but the LB1 or LB2 lock-bits are set, which prevents programming/reading/verifying flash & EEPROM contents.
Apparently the only way to reset the lock-bits is to completely erase the chip, which of course is not a viable option for me. Would be interesting to see if somebody managed to rest the 2 bits without erasing the flash & EEPROM