I decided to try to change the font on my 4.2.1 iPhone 4 to the uber-awesome Neutraface, but I dunno what I'm doing wrong. I have SSH access and followed the directions by backing up the Helvetica and HelveticaNeue ttc files and then copying over the modified fonts, but no success. I can get the lockclock to work just fine, just not the system fonts. Is it a 4.2.1 thing? I can change the system fonts on my wife's iPhone 4 on 4.1 at will.