A BC127 module stopped working after undergoing EMI radiation testing. The module no longer flashes its LEDs and outputs a series of inverted ??'s on the PC terminal. Originally a baud rate of 460800 was used. The module does not respond to commands any more, on any baud rate (9600,115200,460800). Is it possible that the module may have not survived the EMI radiation? and could it be recovered?
Yes, it is.
You can try upgrading the firmware module again.
41110790 BC127 Melody DFU Tool App Note_r1.pdf (352.8 KB)
I would say its unlikely that the EMI killed it, the units are pretty robust. First step is to try to reload the firmware.