Sylvio, The serial numbers are OK : ther shouldn't be an issue with the bootloader for these modules. Just to confirm a few points: 1) Once it has finished loading the firmware, the module will stay in bootloader mode until you cycle the power. 2) On the powerup, does the green LED flash at all - or are both LED's immediately on ?. 3) They are all doing it the same right ? - even when you only have power into port 1 ?. 4) If so, could you try to make a link from a servo cable (connecting the two outer pins like a bind plug) and fit it to port 5 of the Radian, then check if it goes into bootloader or not. I'm a bit busy on some other work for a couple of weeks so I've only got a short window each day to check the forum I'm afraid ..