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Tsop is flashed with Xecutor (the pre-m7 bios, not sure which version as it was done 2 years ago) but I dismissed it as a bios problem because the games boot fine in Normal.
I don't see why you wouldn't update the bios just to be completely sure it's not the bios causing problems. And the fact that it works with the MS bios, but not the tsop bios should be an indicator that it's probably something to do with the bios..... upgrade to the latest X2 bios (or 4981, that bios will work just fine) and see if you still have problems.