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I had this problem (the DEV121.dll error) as well this week. I tried four different PCs and got that error on all of them.
My OFT firmware hadn't been updated in a few years, which I think was part of the problem. OFM showed HW Version 1.0/FW Version 1.24, while my OFT display showed HW 1.35/FW1.55.
The fix for me was to flash the stock map into my ECU, erase the tablet using OFM, re-read the stock map, then upload v4 maps. No more errors, was able to flash the car.
After I wiped it, the HW/FW version numbers all showed 1.35/1.55.
Good luck!
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