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Model sm-t500. Bought March 2021. How difficult is it to remove the back to reset the battery?

Alcohol on the buttons didn't do anything different.

I tried holding both power and volume down for 30 seconds and the boot screen went blank every 4/5 seconds and re displayed. Releasing the buttons left the boot screen on for 90 seconds, blanked for 1 second then repeated.

Holding power and volume down will make the tablet screen go blank in about 5 seconds, then blank for a second or so then show the boot screen. At the point I've been releasing the buttons and seeing if anything happens. In all cases it will continue with the boot screen for 45 seconds or so...

To be honest, I'm struggling to know how to get the unit to power off as pressing the power button has no effect. I can wait for the tablet to fully discharge and then apply charge for 15 minutes or so and try the power - volume down combination which will stop the reboot after about 6 seconds...

I've tried several methods to break the reboot loop such as tapping, slapping, power cycling, but my TabA7 is still not responding to power - volume down resetting. Any ideas?