Garban0x wrote:Does it mean that I should buy a new one or is there a way to replace the bluetooth module?
Anyway thank you for your quick response
First, I would try whether the original Lego firmware still runs and whether it is able to talk to the bluetooth module. If bluetooth doesn't work with that firmware, then I would call Lego and ask whether they replace the NXT. They have been pretty helpful with replacing NXTs with a broken display in the past. You might get a replacement NXT if you tell them that bluetooth is broken. You can flash the original Lego firmware using nxjflash -b.
I'm not sure what I would do next. If you want, I can try to fix the startmenu so that it starts even if the bluetooth module is broken. Then you can keep the NXT but you won't be able to use bluetooth.
However, I can't do that anytime soon. I have a lot of work right now.