TWIDO PLC how to remove active protection bit?

[tintin2005]

hi guys!

is there any solution for active protection bit on twido PLC?

i can read the 24L256 eeprom content and i can see the password.
but if i have the protection bit active i can upload nothing.

if i edit the protection bit from 01 to 00 is necessary to do some math "checksum

calculation" I THINK... and i don´t know how to do it.

i will ppost some print screen of dumps i made and comparison between them.

The rose backgrounded zones are the only changes in all memory dump from the same project.

Spoiler

Maybee some ollydbg experts, or someone else, can check on how twido suite do this calculation and share with us.

can you help ?

thanks guys!