V1.93 does not corrupt all systems. You might want to e-mail Asrock and ask if the version that they e-mailed you is a revised V1.93 that has been corrected or if it is the original. As long as it doesn't corrupt your system when you install it, then you are fine.
Asrock hasn't been real clear on the "corruption" or what the V1.93 does other than "improve RAM compatibility". There probably isn't any system performance gain with any of the newer BIOS as this would require different timings or other settings that should have been fine tuned long ago.