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This radio keeps rebooting after about every 30 seconds (it varies but it's alway less than a minute). It's out of warranty and I replaced it with a spare, so I can freely "play around" with it. I'm trying to revive it. So I completely took it apart. On the circuit board there appeared to be some slight sign of rust here and there and I brushed those off. They came off easily. I fully cleaned up all parts and put it back together but the problem continues: short uptime and then reboot.

So I attempted a firmware update but it fails, seemigly on the last step. It erases and re-writes many parts of the stored data or software, but then it always fails with an error message after about 6-8 minutes:
timeout error [cps_data]!

This is how far I got and can't get past this point. I can't even turn it on normally any more, looks like it's corrupted due to failed firmware update attempts.

Anybody has any ideas?