poor new BIOS (A08) for my XPS 13 (x321-6184) ?

I was happy when i found a new fresh BIOS for my XPS, bc sometimes it was booting with beeping and notifing that something wrong with my battery (but it happened very seldom) . But when i flashed the new one, my XPS started to behave strange. It went to sleep mode like before, but in 2-3 hoursafter the fan started to work very intensive and the led was lighting all the times like it's charging, despite the adapter wasn't pluged in. The screen was black and only pressing on power button in 4-5 secs turned it off.
Flashed BIOS back with A07 version and now it works ok.