TWIDO PLC how to remove active protection bit?

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tintin2005
Posts: 25
Joined: Fri Apr 30, 2010 10:30 pm

TWIDO PLC how to remove active protection bit?

Post by 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.
Screens
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Maybee some ollydbg experts, or someone else, can check on how twido suite do this calculation and share with us. (oo)

can you help ?

thanks guys!