Ok so I'm kinda new... I've read a few posts, downloaded a 2.3.4 complete rom from a couple different sites renamed it update.zip to the root of the sdcard, and it aborts the installation because it says failed full line signature verification or something like that. I'm not rooted nor have I ever been, just a stock phone that received the ota unnoticed. I don't like the update, how can I go back to grj22?