JC Battery Flex TAG for iPhone 12 Mini

Service battery flex by JC for Apple iPhone 12 Mini.

Update FIX for iOS version 17.4

After updating to version 17.4, to set 100% capacity and 0 battery cycles, it is necessary to use the 3U Tools program.

Download the 3U Tools program here.
*It has not been possible to verify how the battery capacity percentage will decrease over time. Once we have tested it long enough, we will provide this information.

Articles for iPhone 11 and newer still require the use of TAG-ON flex.

*This guide also works on older versions of iOS.

1. Backup the phone's memory to the computer. In the new procedure, it is necessary to perform a system flash via 3U Tools and then restore the data.
2. Set the original battery (or a battery with the original BMS flex) using the TAG-ON Flex programmer to a capacity of 100% and reduce the number of cycles to 0.
3. Thoroughly solder the original flex to the new cell and permanently connect the Tag-On Flex.
4. Insert a non-original battery into the phone and turn it on to trigger a message about a non-original battery in the settings - battery - battery condition and charging.
5. Turn off the device and remove the non-original battery. Insert the modified cell with the original BMS flex and Tag-on Flex, adjusted for capacity and number of cycles, into the phone.
6. Connect the phone via cable to 3U Tools, download iOS 17.4, and select the Quick Flash Mode option. Download iOS version 17.4 and check the Fix battery health during Flash option, then click the blue Flash button (see image).
7. After installation, activate the phone and check in the settings - battery - battery condition and charging.
8. Done, you can now restore the backup from step 1.