I could not recreate the issue with the debug version, it always read the correct battery percentage and did not go to 99.
I still captured the text from the serial terminal and pasted it here: Bremote V2 DxMxK Debug Log 20260920 - Pastebin.com
I also captured a video of it. https://youtube.com/shorts/_OsaYPs2-Cg?si=_rNiO5TJ0RseW2z-
I think I found the issue.
Fixed in 2.2.8.1, see releases.
Only Rx has changed, Tx remains 2.2.7.2, so no need to update Tx.
Hi together,
I made a new tool for flashing firmware, completely in browser
Check it out if you have time and let me know if it works 
Just select upload type, device, version and select the COM port, then click on “FLASH”