Originally Posted by scotty85
hmm. thats very peculiar... error 99 is typically what you get when running a signed ruu with s on,and an unlocked bootloader.
had you guys OTAed to 1.27.531.8? could be a main version prollem,i guess,but typically that would give you a different error
I know this is a old thread but the error 99 is because the bootloader is unlocked. you need to relock the bootloader to Run a RUU with s-on "fastboot oem lock" the the RUU will work then, Another thing is with a phone that has no external sdcard you cant the usb storage in recovery with out a OTG cable. You need to use sideload...http://forum.xda-developers.com/showthread.php?t=2318497