I just booted a 10.2 rescue disk then mounted the hard drive partition where my downloads are, and the flasher program worked but failed part way through, try as I might I couldn't get it to finish. Sometimes it barely starts before reporting protocol error, sometimes it gets up to 17% of the way flashing the main file system before reporting write error.

I'm worried I bricked my tablet now :-(

I tried a different USB port too, no change. I'll try a different computer in case that works.

arrrrgggghhhh!