I have unlocked the bootloader using HTC Dev site and it is unlocked.
Then I have got a permanent root using HTC Super Tool v3 and I have root access.
S-ON. So when I downloaded the zip file, copied it to root of the sdcard with the name of "update.zip" and then followed the procedure for S-ON, I get the error when I try to "Apply sdcard:update.zip"
Finding update package...
Opening update package...
Verifying update package...
E:failed to verify whole-file signature
E:signature verification failed
Please advice. Thanks
[In Theory, theory and practice are the same...In practice, they are not.]