1.In iOS18.0 or iOS18.1, after replacing the battery, iPhone shows old battery percentage.
2.Quick Flash in 3uTools, tick “Fix battery health during Flash”
3.Flash until it shows Error.
4.Force Restart the iPhone, first press and release Volume +, then press and release -, hold Power
button unt il the iPhone turns off.
5.Turn on the iPhone and continue Quick Flash, this time don’t tick “Fix battery health during flash”.
6.It shows Flash Completed.
7.iPhone shows 100%.
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