Ok, it was simple beyond belief. Probably simplest device I ever opened. Just lever the lid with screwdriver, done.
First thing I noticed was that cable connecting battery with PCB was barely connected and loose. It wasn't put in straight, but a bit crooked. It's also very easy to move it around and it's still pretty loose. I suspect this was the reason for all my pains till now.
Anyway, I fixed the connection and I'll see if it helps. If it was the reason for the device malfunctioning all along then I'll be angry at myself for not opening the device due to warranty. And at Onyx for never fixing it properly.
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