@eliasp @danluu Many faults can actually be cleared by changing the terminal 15 (switching off) or are then only historically in the fault memory. I can't say exactly what's going on here, I'm more familiar with German OEMs, but normally each control unit has its own SW. I can imagine that something in a very important unit (drive control unit/pulse inverter/battery) may have failed during the OTA update or the communication is no longer error-free.
SW dev. is often rushed and lacks testing...