I have the V500 on CM12.1 unofficial. Everything was fine and then I went to do a backup in TWRP. Then I looked at the restore menu but didn't do anything. I backed up to my SD Card. Then I booted back into the system, but all that came on was the back button and the notification tray and status bar. The background was black. No home button or multitask button. So I reset it a few times. Eventually I could get into the tablet but when I clicked on a app nothing opened. I then reset it again and it kept coming on with that partial screen. I tried to boot into recovery to try and restore the backup but ADB was locked and the button combination didn't work. So I decided to flash back to stock using LG Mobile Tools. Eventually I could get into download mode but when it got close to finishing to flash the software it stopped and gave me an error. After doing some hard reboots it eventually flashed the software because it would boot into the LG screen. But it was stuck in a bootloop and I've read that in order to fix that you need to do a factory reset. So I tried to boot to recovery but when I pressed and held down volume down and power nothing would happen. Sometimes it would flash the LG logo for a split second. Eventually after a lucky try the LG logo stayed on and I could boot to recovery and do a factory reset. Then everything was back to stock. But when I turn off the tablet it won't power back on unless I plug in the tablet. Battery is fine. Regular battery life it just won't turn on when I power it down without being on the charging screen.
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