View this article at: http://dev.macnn.com/articles/07/09/24/relocking.your.iphone
Monday, Sep 24, 2007 9:05pm

Relocking your iPhone, modd...

Although Apple today said it would void the warranty on iPhones damaged by the unlock process (or subsequent iPhone updates), users may be in luck with a new re-locking process outlined by one reader (but not yet tested by MacNN). The unlock hacks are not undone by a full software store; the re-lock process is still in flux and comes with the appropriate warnings to users until finalized, allows users to restore their phone, so Apple's forthcoming update -- due later this week -- does not render it inoperable: "It is believed the above proceedure will relock your iPhone and prevent it from being made permanently unusable by the upcoming firmware update. There is no gaurantee [sic], however, and I take no responsibility for your iPhone if the above procedures do not work for you and your iPhone gets hosed."

These instructions are in flux - do not use them until I say they are finalized.

on your Mac, go to your home directory and create a directory called relock
set your iPhone to never autolock the screen
put a copy of the 1.0.2 firmware in a directory on your Mac. If you need to download it, get it from here.
rename the extension on the firmware from ipsw to zip
unzip it
run: dd if=009-7698-4.dmg of=ramdisk.dmg bs=512 skip=4 conv=sync
use finder to navigate to the directory where ramdisk.dmg is and double-click it to mount it.
copy the following files to the relock directory you created in the first step:
- /Volumes/ramdisk/usr/local/bin/bbupdater
- /Volumes/ramdisk/usr/local/standalone/firmware/ICE03.14.08_G.eep
- /Volumes/ramdisk/usr/local/standalone/firmware/ICE03.14.08_G.fls
on your iPhone, run: mkdir /relock
copy those three files to your iPhone: scp -p bbupdater ICE* root@youriphoneip:/relock
on your iPhone, run: cd /relock
on your iPhone, run: cp /System/Library/LaunchDaemons/com.apple.CommCenter.plist /var/root/media/com.apple.CommCenter.plist
on your iPhone, run: launchctl unload /System/Library/LaunchDaemons/com.apple.CommCenter.plist
on your iPhone, run: ./bbupdater -f *.fls -e *.eep
on your iPhone, run: launchctl load /System/Library/LaunchDaemons/com.apple.CommCenter.plist
on your Mac: exit iTunes
on your Mac: kill iTunes helper
manually place your iPhone into recovery/restore mode
connect your Ihone to the computer and start iTunes
restore your iPhone

The update appears not to break or affect third-party apps installed, although users may have to restore the iPhone before the next update Meanwhile, another site has documented how to mod your iPhone keyboard, including the iPhone Shop tools and pre-made keyboard styles.