Battery temperature low, phone not charging

Recently i replaced just front display, not whole case. After that, my phone shows me Battery temp too low, charging paused. (Diag. Tool shows average -4°C to 4°C) AccuBattery app it shows cable, like it is charging, but at 0W, top right battery icon doesnt show lightning (charging). Flex charging cable has been replaced. Another thing, it just doesnt accept new battery i bought when phone started doing this, coz i thought it just might be battery. After connecting new battery, boot shows Huawei logo, then phone shuts down. I actually managed to boot just ONCE for the first time i plugged the new battery, immidiately i tried to charge it, but after that as i mentioned above, no charging logo top right, Accu shows charging, but 0W. So i rebooted, but then Huawei logo, then shut down. And so on..

Another point - I actually managed to charge it ONCE from 10% to 60% without it stopping, battery temp was normal (13-18°C, showing at diagnostic tool, --talking about old battery, which is the one im able to boot with and is still in phone, coz new one doesnt work for me - any ideas why?) Only thing i thought might cause the problem where broken pins on old flex cable i already replaced (pins on mobo seems fine with naked eye, dont have microscope sadly)

So another question, where is temperature sensor actually located, so is there a way to check it if it is ok physically?

Also in eRecovery mode top right icon (battery% one) shows charging when charger plugged in.

I tried :

• Factory reset (settings)
• Factory reset (Power+VolUp)
• Clear cache (Power+VolUp)
• Hotswap battery while charger in (heard it might boot with the new one coz it thinks its old one)
• Cleaning pins
• 5 different chargers from 5W to original one

I BEG FOR HELP, IM SO HOPELESS haha

THANKS FOR ANY TIPS.