boot issue

Got message Openatv image out of date need to flash box, so downloaded latest Openatv, formatted USB and tried to flash box. Sometimes it skips by the flash and goes straight into boot, when I can get it to flash and boot, it stops on either 49 or 00. I have tried several USB sticks and various...

Grogbuild won't boot after update. I updated via the blue button like normal, but the box gets stuck at 50% and stays there. Anyone experiencing similar?