Erase all content and settings

[Selumaior]

Hello,

I need some help. A buddy of mine bought a second hand iphone 3gs with fw 4.2.1, jailbreaked and unlocked. Immediatly after he got it, he used the "erase all content and settings" option.

The first thing I did was to verify what bootroom does the phone have. iDetect says that it is old bootroom, so restoring shouldn't request blobs.

I tried to restore it to 5.1.1 via shift+restore in iTunes, but I got alot of errors and I couldn't get by error 1600. Tried everything, like using iReb, changing the cable and the usb port, but nothing solved it.

What can I do to make it functional again. The thing is that the phone was bought from some other country and I will need hacktivation.

I thought to try and restore it back to 4.2.1. Would this work?

Thank you for your time!

[masterkeyunlocks]

try restoring with redsn0w. verify the existing blobs and select the firmware you wish to restore. i'm not sure how the old bootrom and request blobs works but i believe that you need the shsh in order to restore any phone. i think the oldest version that you can restore with redsnow for the 3gs is 4.3.3

How to downgrade or restore using Redsn0w - No Tinyumbrella or iTunes!! - YouTube

[Selumaior]

try restoring with redsn0w. verify the existing blobs and select the firmware you wish to restore. i'm not sure how the old bootrom and request blobs works but i believe that you need the shsh in order to restore any phone. i think the oldest version that you can restore with redsnow for the 3gs is 4.3.3

How to downgrade or restore using Redsn0w - No Tinyumbrella or iTunes!! - YouTube

Hello,

I was finally able to solve my problem via redsnow restore to 4.2.1. I followed the video you posted just above.

Thank You very much!

[masterkeyunlocks]

Thanks for confirming that 4.2.1 works