iPhone 12 & iPhone 12 Pro Battery Replacement Without Pop up error message

www.polartech.com.au/collecti...
installation display: shows the troubleshooting method for the component.
Caution: The battery of the mobile phone must be the original one, and the battery efficiency can be checked. If you have replaced other batteries, installing a pop-up-free battery will not solve the problem of unknown parts.
- The first power-on power is "100%". If it is not "100%", there is a certain probability that the installation is unsuccessful and needs to be reinstalled, including the original protective plate and the battery terminals without pop-up windows, which must also be re-buckled.
- The battery is 100% but the unknown component is still displayed after restarting. Take a third-party battery (branded battery or disassembled old battery) and install it with a pop-up window, then install the battery without pop-up window. Or use another battery to connect to the pop-up-free battery, install and turn on the phone, and then reinstall the original battery cable and pop-up-free battery. In this case, the data reading usually fails, so you need to refresh it with other battery data, and the new data can usually be read.
- Be careful not to buckle the original protective board seat in the opposite direction. The metal points inside must match, and the positive and negative poles must match, otherwise the connection will not be possible (that is, the left and right directions must be distinguished). The reverse direction will also affect communication.
- When installing this model of 11, because the position of the seat is recessed, the cable must be bent and pressed down to make it fit better.
- The auxiliary terminals and the original cable must be installed in alignment, and the positive and negative poles must correspond, otherwise the connection will not be possible, that is, the left and right directions must be distinguished.
- Bend the cable as carefully as possible to avoid breaking the cable and causing failure to connect.

[@thewolfo2190]

I installed that battery and at first it show me the message "Unknow piece" and I checked the connections and then it show 82% of health (My battery was at 82% of health in the moment of the change) why is this happening?

[@polartechonline]

Does battery life in 3uTools show 100%？In the latest system version,have to do a quick flash firmware,also tick [fix battery health during flash ].