Hello .. thanks for the answer. I am working on sourcing a replacement board to try if it works. Meanwhile when i connect the battery repair board to program the battery, i notice the following :
The battery board detects the battery on all iphone models i tested (8+, XR) and I am able to change the battery capacity and percentage from qianli (both from machine and PC). So for instance if i program the iPhone XR battery capacity from 70% to 90%, qianli does it with by successfully write message, I can confirm this by removing and re-connecting the battery to the connector board, and qianli reads and shows the battery capacity with new updated changed cpacity as 90% on its display screen. However, when I insert the battery back and connect the phone, it shows the same old 70% "Service" status in the maximum capacity.
I tried doing many power cycle (discharging and fully charging) my phone many times, also tried installing IOS operating system several times but it still shows the old battery capacity. It looks like in the new ios releases Apple did something so that the ios reports only the old battery capacity even after someone changes it. Any solution to this?