Purchased a BlackVue DR500GW-HD from Korea, with Korean firmware and player. Read the forums and soon found out I couldn’t down grade from 1.008k to 1.005k then over to 1.005e then 1.008e.So I had a play and changed the version to 1008e manually as shown in earlier threads and realised I lost all voices not the end of the world I thought, then when I put the cd card into my laptop the blackvue player didn’t recognise my cd card so I changed the stock player version from 2.035 to 2.032 and bingo. Then I had all the led’s on the camera flashing, I knew this would be telling me different version in a loop but I had no voices so nothing audible so I disabled all the led’s on the player and that was it, I now only have the blue gps led on.
Hope this help you.