I noticed your comment about reapply firmware failed - that’s something you really need to be able to do. Can you boot into bootloader mode and erase everything, or attach to the device in MFDeploy? If not, can you tell us what devices appear in Device Manager when you boot normally and into bootloader mode?
Did you have any thoughts about what, if anything, changed ?
So I would be extremely surprised if this was actually your solution, but your statement implied you had some fundamental problem communicating from your PC to your Cobra2 (“I already tried to reïnstall the firmware but i receive time-outs” meant to me that you had timeouts doing the firmware update). Resolving that was necessary because it was pointless trying to troubleshoot any other issue when we didn’t know what was going on with your Cobra.
Personally, I would expect that you should have tried rebooting your wifi router as the first troubleshooting step. They are what I would see as the weakest link