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You got bit the same way my LG G4 bit me :-(. Bad solder or bad components caused it to bootloop to death - sadly in my case, LG is infamous for this issue which is why they're on my bad list - but the reason is established and a method could be devised reliably. Supposedly the newer phones like the G5 and V20 don't fail at such high rates (some will always do it), but I don't trust them with how many of their phones are known to bootloop - it’s at least 10 between 2015-2016, so not a small sample and it’s hard to trust any of those secondhand from those years just because of how many they had to admit are bad. They burned a lot of people and their mobile sales took a nosedive. LG took the Apple approach to hardware problems, which is why they’ve lost a lot of trust.

I got data back on mine since it was a fresh failure, I didn’t mess with it until I devised a plan and I stopped using it AFTER recovery was done, but if you boot it too many times the corruption caused by the bad parts can hurt your chances. Hopefully the issue is fresh so you have a chance. DO NOT MESS WITH THE PHONE UNLESS YOU INTEND TO RECOVER DATA YOURSELF; any attempt will decrease your chances in the future. Yes - even a hairdryer.

However, if you are brave enough and it is just a solder issue, I detailed the procedure on my own Answers question: How do I get the phone working for data recovery?. The disassembly procedure is different between my (now rotting dead) G4 and this, but the heating procedure is similar. Leave it disassembled with the board exposed in such a way you can keep it at a stable temperature if possible, especially since the hairdryer method just keeps it alive enough. It helped with my G4 since I had to keep it below a certain threshold or it would force itself off with no way out, and being too cold caused it to die.

I probably should have a made a guide but when you have irreplaceable photos I’m more worried about a successful recovery then doing it “the right way”. I also do not want to be at this point again, so there’s no point in sending a phone with known issues in for repair because you’ll get a phone with the same flaw and reduced chances of a 2nd recovery because LG is probably reflowing bad boards and doing the bare minumum to settle their legal troubles from the phones they admitted have problems. As far as a new phone, stay away from the model/manufacturer you just had trouble with and LG - they both famously have issues. Buy a completely different phone from a different manufacturer without known issues - so far, Motorola has been good for me and I have yet to see one bootloop to death from them yet. My only gripe is software updates, but they also sanction bootloader unlocking on retail phones, and carriers who tolerate the practice.

If you do not care about the data, it may be possible to recover the phone by flashing modified files to the phone to get it running again, but at the expense of only running 4 cores. The problem is you only run on 4 cores, so if you can reflash it by “disabling” part of the CPU that’s leading me to think there’s a flaw with the processors or solder problems on the 6p.