The ONLY method to fix battery health
Ok this will seem like a joke but I promise it’s not I used on iPad Air m2 11 inch and gained 7% bh
I did it yesterday and don’t have screenshots but please trust me on this one
Note: this only works on devices they have used the 20-80 rule for a long time or atleast 80% charging limit for a long time
This is also not guaranteed to work but worked for me since I also have been running developer betas for long time
You will have to update to iOS 26.5.2 at the ends and around 20GB of internet is used
Prerequisites: Computer, good cable and internet, ipsw of iOS 26.5.2 for your device (will make the process faster as you can download on your computer first while device is being discharged or charged, back up all your data using iTunes)
Step 1: remove the charging limit and use your device till it turns off (make sure if it is iPhone 17 series then it is on latest version of iOS else YOU WILL BRICK YOUR DEVICE) now try to power it again on
if it doesn’t show battery low sign then just keep using till it gets lower and finally it should ask you to plug in when you press power button
Step2: charge up to 100%, keep it plugged in and wait for one hour
Step 3: Now update to iOS 27 DB2, other betas might work as well for iOS 27
Step 5: Now you can kiss goodbye to your data and plug it in to your computer and flash iOS 26.5.2 to your iPhone, DO NOT check the fix battery health option but check the erase data, check auto activate to make it faster
Step 6: after booted up your device, should be setup with as little info as possible, now meow at a cat. see the battery health option it should be more than current, if it isn’t then just reflags again with fix battery health option (only do if 3utool reported battery health difference is MORE than 4%)
Step 7: restore in iTunes using backup.
Step 8: Next time please turn off charge to 80% limit every 2 weeks and charge fully once, drain fully once every 2-3 months
This bug exists only because apple takes 2-3 months to force charge to 100% if this doesn’t work for you then use without the limit for 2-3 weeks then it may work for you