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Decrypting and encrypting firmware T-NKLAKUC_2201.0

Posted: Mon Mar 07, 2022 10:23 pm
by JackaFacka
Hello everybody.

I have successfully decrypted T-NKLAKUC_2201.0 firmware for Q60T by using synacktiv's firmware decryptor which is open source on github. The next thing is to modify the firmware and encrypt it again back to upgrade.msd. The only problem is I don't have knowledge to encrypt it back. If somebody can make a python script for encryption it would be awesome! Or is there an universal way to encrypt files with aes encryption?

Re: Decrypting and encrypting firmware T-NKLAKUC_2201.0

Posted: Tue Mar 08, 2022 7:05 pm
by sectroyer
JackaFacka wrote: Mon Mar 07, 2022 10:23 pm Hello everybody.

I have successfully decrypted T-NKLAKUC_2201.0 firmware for Q60T by using synacktiv's firmware decryptor which is open source on github. The next thing is to modify the firmware and encrypt it again back to upgrade.msd. The only problem is I don't have knowledge to encrypt it back. If somebody can make a python script for encryption it would be awesome! Or is there an universal way to encrypt files with aes encryption?
You don't have a key for that :) Once you modify fw RSA signature will NOT match. Synacktivs research doesn't tackle that. As a result You CAN encrypt the fw but it will NOT be (RSA) signed and as a result system will NOT install it. :)