@serhio

ended up just selling the phone for parts lol.

good luck with it!

my second phone is also an oneplus one but I dare not change the battery, suppose something goes wrong

so i understand it might help by replacing the battery with a new one?

no, charging light doesnt light up but it does start up if i connect it to charger/laptop

i cant run commands on the phone

I think the battery is fine because when Android was still on,
it worked great

https://photos.app.goo.gl/keLfhLwqKxHUQvhRA
video

i have found this:

I now get the blue battery low message after the key combination,
but I have charged the phone all night.

https://paste.ubuntu.com/p/cpGpX447qJ/
another log