If the bootloader is intact then you should be able to force a firmware update. If the bootloader was included in the update you wer flashing at the time ..then I suspect it will stay bricked.. Removal of a memory chip and external flash being the only way to fix it .. A it's not easy .. B if the chip is BGA ...forget it .. C you neeed the correct binary file ..or clone file from a working box. D Cloning the chip is tricky and could brick both boxes. E you need a suitable programmer and suitable TSOP base .. F ...if you don't have the neccessay skills ...again ..forget it.