You'll only brick the board if you remove the media the BIOS file is on whilst it is flashing or the power goes out. It takes a couple of seconds to do and I bet it will help to solve your issue. Get your motherboard manual and read up on how to do it. then do it. You've done stuff far riskier than flashing the BIOS in the past - running your PC on a crappy PSU for 2 years, for example.