The battery is charging but the percentage does not change

[mami49]

Hello, after installing the ROM on my Redmi 9t device, the battery level remained at 50% (my battery was at 50% when installing the ROM). Will my problem be solved if I install the ROM again? While looking at the topics in the forum, https://xiaomi.eu/community/threads/charging-but-percentage-not-changing.70806/ I came across this message on this topic https://xiaomi.eu/community/threads/charging-but-percentage-not-changing.70806/post-712750 how can I do this? I have a computer. Can someone tell me what I need to download and what to open, thank you