Talk:Preventing Baseband Update

No success

I tried this and it didn't work. I used an iPhone 4 with firmware 4.1 and baseband 1.59.00, trying to upgrade it to stock firmware 4.2.1, preserving the baseband.

One thing that was unclear is the plist edit. There was another entry SystemPartitionSyize=1024(integer) (<key>SystemPartitionSize</key><integer>1024</integer>). It was not clear if this should be removed or not. I tried both.

To reencrypt, it used the command

xpwntool 038-0032-002_modified.dmg 038-0032-002_reencrypted.dmg -t 038-0032-002_original.dmg -k 06849aead2e9a6ca8a82c3929bad5c2368942e3681a3d5751720d2aacf0694c0 -iv 9b20ae16bebf4cf1b9101374c3ab0095

With key and iv from here (must be correct, otherwise decryption wouldn't have worked). Then rename 038-0032-002_reencrypted.dmg to original name and back into the ipsw.

To prepare for custom firmware flashing, I used redsn0w 0.9.6b4, reading initial 4.1 firmware.

Without the SystemPartitionSize, I received an iTunes unknown error 46 when it started to flash. With the SystemPartitionSize it went a few seconds longer and I got iTunes error 14.

Anything I am doing wrong? Did anybody else complete this successfully? Or was this just a joke? --http 03:14, 29 November 2010 (UTC)

well what ipsw did you restore to because restored will signature check the root filesystem after ASR but the SystemPartitionSize should be replaced with <key>SystemImage</key> <false/> if you dont want to update the root partition --liamchat 16:06, 29 November 2010 (UTC)

ipsw: 4.2.1 as I said. Why should I not update the root partition? The goal is to upgrade firmware from 4.1 to 4.2.1, without updating the baseband. Did you do this and were successful? --http 19:40, 29 November 2010 (UTC)

why are you using the original file as a template --liamchat 23:02, 29 November 2010 (UTC)

Because xpwntool says so. Is that wrong? --http 23:17, 29 November 2010 (UTC)

it is optional if you want to the code just says create an abstract copy of template if has key --liamchat 23:30, 29 November 2010 (UTC)

merge all ipsw modifications

Shuld all pages that describe how to make changes to the restore process be merged into one page --liamchat 23:02, 29 November 2010 (UTC)