Chris, Thank you so much for the fix! I was curious about what causes the spot which my tablet also had, it disappeared and appeared again, then suddenly after one or two days of inactivity again disappeared – now I know what is causing it.
I wrote to the seller (on Aliexpress) but he suggested to do the hardreset, which I wanted to avoid to do – your fix helped!
I applied the glass screen protector to my Hi8, it looks terribly as the display is not completely flat (air bubbles and corners are not completely sticked), but at least it (hopefully) helps again these spots…
Once again, thank you Chris!