I know nothing about that particular drive, but if you flash it using the correct method and firmware (model/revision) then the probability of failure is low.... If the flash does go wrong, e.g. mains power failure and the drive no longer responds to flashing commands then it is probably a paper weight...unless it has a jtag port (PITA).
Most people choose to run software (such as AnyDVD) which removes the region code and other DVD protections. This is completely safe ie no flashing is required.
Cheers.
P.S. It looks like DVD43 is just a decrypter - it does not remove the region code. Uninstall it and install AnyDVD. It will allow the DVD to be decrypted and also remove the region code.
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