I was sceptical of this myself, though it worked for me on S20 ultra (oneUi 3) can't verify for other devices . Turn off the phone and plug it in to a generic slow charge brick. The phone should then display it at 0% but quickly shoot up to whatever percent your actually on. Then turn the phone on and low and behold it worked.   https://youtu.be/SH7jIyyU9pQ   tip from this YouTube video (step 3)   Edit: as soon as you've done this you can plug your fast charger back in  ... View more

I was sceptical of this myself, though it worked for me on S20 ultra (oneUi 3) can't verify for other devices . Turn off the phone and plug it in to a generic slow charge brick. The phone should then display it at 0% but quickly shoot up to whatever percent your actually on. Then turn the phone on and low and behold it worked. https://youtu.be/SH7jIyyU9pQ tip from this YouTube video (step 3)   Edit: as soon as you've done this you can plug your fast charger back in  ... View more