Back up firmware

I have a lg cdrom .
i accedentally upgrade it to OEM firmware version 2.00.
can you help me restore it back to firmware version 1.04?
If not, then is there another way to upgrade it back to firmware version 1.04?:bow: :bow: :bow: :bow:

it is a lg cdrom 52x ( CRD-8521 ).

Sorry, but i don’t think that there is… have you tried mtkflash? I doubt that will work though.

where???
is there any older firmware then how???

t111645

What is the model number of your CD-ROM?

Cuss

Read his second post.

it is a lg cdrom 52x ( CRD-8521 ).

its CRD-8521B
s/n : 1AHA004040

can anyone make / has the LG CRD-8521B ?

Does mtkflash work with your drive or not?

Does this work?

no