Can't say, I only did a binary compare on the firmware from the 4.18.502.7
OTA and the supposedly 4.20.502.1 RUU... and everything was a match. Don't have the picture anymore, sorry.
Also can't help much there, only thing I can say, was trying the 4.19.401.9 RUU.EXE and
encrypted ruu.zip (extracted from the temp folder) for more than a few times, with some
really weird errors, until the guy changed PCs... though he tried a USB2 port on the same PC, etc. etc. etc. he finally got it working by using a different "cleaner" (not so many programs, antivirus, firewall).
PS: He was S-On.
---------- Post added at 12:09 AM ---------- Previous post was at 12:08 AM ----------
check MD5