How do you back up firmware for TEAC W540 burner?

I am currently running firmware version 1.0D on my TEAC W540 burner and I want to upgrade to 1.0F only to gain 2x for some of the re-writable cdr’s. But I want to be able to go back to 1.0D if I have problems.

Any advice on how to do so will be greatly appreciated.

I don’t think that mtkflash works with this drive so you may need to somehow trick the flasher. You can try renaming the firmware file to something higher or try modifying the exe

maybe you could use the 1.0C flasher from here…

Thank you for your reply, but I don’t think i will risk it.
I may just leave my firmware at 1.0d and burn rewritables at 10x.
I used to burn at 4x with my old burner so this is a big difference to me as it is.