Raiju Ultimate (1st Gen) - Can we revert to an older firmware version?

I recently updated the firmware of my Raiju Ultimate PS4 Controller to the latest one v1.03 a few months ago (I assumed that what I have is the 1st Gen as I recently heard that there was a 2nd Gen released which could be upgraded to firmware v1.05 - as mine could only be updated to v1.03)

I noticed immediately that the stick drift got a lot worse but I thought to try to test it out, hoping it might get better.... Sadly it didn't.

I was thinking if there was a way I could get it back to the previous firmware I had as it proved to be a lot more stable.