tv lcd 19mb27- vestel- help

[py4wt]

I need help on a lcd tv brand Vestel, mod. 17mb27-2, in service menu was changed the version of firmware, and she turned off the screen.
need to return the old firmware, but not in Brazil have no info. already swapped the memory, but must be recorded in Micronas.
I thank anyone who can help.
tks.