I have a problem trying to go to B510.
Everything according to description done:
file rename "update.zip", put in "dload" in the root of sdcard (FAT32)
but unfortunately continued the message "E: signature verification failed".
Current version is B610 (Vodafone?)
the versions I've tried are B107, B111, B118, B119, B122, B125, B132 and B510 course. Also tried to downgrade to Unicom_emui2.0.
All to no avail, and everywhere the message "E: signature verification failed".
Who can help me?
Many thanks in advance!