Whatever else you do, don't mix and match firmware and flash tools. Obtain the whole package and use the flash tools in that package to flash the card with the firmware in that package. If you try another package, use that flash tool etc
That makes sense. I'll do some searching again to see if I can locate a place to download the flash tools and the current firmware together. The initial problem that I had was what I downloaded had the P7 and P16 firmware, so I had to search for the P20 to get the current version.