I had my T62B in a boot loop as well and it couldn't be turned off. Hubby messed with it and got it in the proper mode by pressing the refresh button and using a pin in the reset hole while usb connected. I used the RK batch tool in the first post here
https://www.mobileread.com/forums/sho...d.php?t=245888 I applied the latest update after and it now uses 45% battery in 24 hours so I have more work to do. But at least I'm not boot looping anymore