Lg g3 turning off problem - G3 Q&A, Help & Troubleshooting

My lg g3 d855 keeps turning off. It comes to the lg logo and then turn off.
I recently try to downgrade my software with LG Flash Tool, but in the process it turned off.
It still keeps turning off, event though it starts to install software on download mode when i try to turn on phone.
What should I do? I dont wanna lose my data.
Please help
update: tried with lg up, phone turned off at 10% updating

This is already exist here in these topics.
https://forum.xda-developers.com/lg-g3/help/lg-g3-endless-bootloop-battery-t3584567
https://forum.xda-developers.com/lg-g3/help/lg-g3-restart-loop-t3589071

Didnt help
But my phone turned off after lg logo, tryed flashing stock rom in download mode, phone turned off in the middle of process and now stuck in download mode, any flashing or updating with pc turns phone off and disconnects. Same thing with new oem batery which works on friends g3

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Thanks.
Nevermind.. Say hello to a new bootlooping LG G4 !!
I put it on the freezer and after 20 minutes the phone boot up normal, but after a few minutes it went the famous boot loop.
Time for a new phone

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