til I started a hype. Yay! 😎

before considering replacing a module, check if all connections / connectors are solid and in place. i bet a lose connector causing a short could cause this issue.

I´ve been running A13 on my fp4 for weeks, and it is working well for me.

-black screen / stuck at unlock: as someone has already pointed out, it seems to be related to “auto screen rotation”. I have it turned off by default, anyways.

- wifi is okay as always. but i have to say i´m struggeling with dualsim connectivity atm, but that´s another topic.

- bluetooth works as expected, no turning off or similar. maybe it´s a bug in android auto, since you mentioned “car systems”?

- the cam is okay´ish but suffers badly in low light situations… the wide angle cam doesn´t add a rainbow effect as a feature, but yes, if sun shines from the side onto the lens, this is the expected outcome. I suggest you either try to fiddle with the settings (maybe you set it to medium quality?) or try another camera app, like gcam.

Which phone are you talking about?

I guess the FP4. Honestly, a lot of the stuff you describe didn´t occur with my fp4, so either you´re unlucky, or I´m lucky.

on A12, hotspot and tethering did work, iirc. screen going just black didn´t occur. Sounds like an app interfering here, honestly.

a13 - works without a problem, didn´t brick it. but you´re not the only one reporting this issue, so it would be interesting why A13 works for some, and not for others.

5G i can´t test anymore, because i terminated my 5g contract; was simply not worth the money and battery drain.

speakers don´t rattle… are they loose?

support on technical issues is bad, thats true. i HOPE it gets better again after the initial workload from the release of the fp5 is down a bit.

after all, why don´t you save your data, do a complete reset and try again OR switch to another brand if you´re that unhappy? you can always sell the fp4, they still fetch a good amount of money used.