Some People who were using blacksn0w on their iPhone 3GS at 3.1.2 tried to apply the Spirit JB without removing blackra1n. They found themselves in a reboot loop or stuck at the Apple or recovery screen.
Note:Do not use this method if Cydia has your 3.1.2 SHSH hashes on file – it's overkill! Just restore to 3.1.2 using your saved hashes instead. (But if you've already got 3.1.3's baseband on your iPhone, it's already too late for you and you must wait for the next unlock. This method doesn't change that.).
Requirements:
- Using iPad 3GS
- No 3.1.2 SHSH blobs on file with Cydia (or locally on your computer)
- You've never updated or restored (or bought your iPhone with) stock 3.1.3 before
- Have access to a SIM card that will allow your iPhone 3GS to activate through iTunes.[Important]
- You're currently in a reboot loop or stuck in recovery mode. If you're not, You may want to leave well enough alone for now.
Step 1: Make sure you have rslite or iRecovery handy and that you can run it. You'll need to use it after iTunes errors out.
Step 2: Unzip the 3.1.3 IPSW. You'll be making three changes to it.
Step 3: Remove Firmware/all_flash/all_flash.n88ap.production/LLB.n88ap.RELEASE.img3
Step 4: Edit Firmware/all_flash/all_flash.n88ap.production/manifest. Remove the first line (LLB.n88ap.RELEASE.img3) then save back the file.
Step 5: Remove the two references to LLB in BuildManifest.plist. You want to remove the lines starting with
Step 6: Zip it all back up. Keep in mind that the top-level of the zip should be that directory where BuildManifest.plist is. (Don't zip it from the folder one level up from this by mistake).
Step 7: Restore or update to this modified IPSW (not the stock one from Apple!). It will eventually error out (error #6).
Step 8: Use rslite or iRecovery to get past the subsequent recovery screen. Using rslite, you'd do:
% rslite
rslite v0.2 - by the iPhone Dev Team, 2009.
--THIS IS AN UNSUPPORTED TOOL--
Connecting...
[Recovery] setenv auto-boot true
[Recovery] saveenv
[Recovery] reboot
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