If you have a jailbroken iPhone, you can simply restore using costom firmware. If you don't have a jailbroken iPhone...you won't be so lucky. So after trying over and over...I finally figured out a solution.
Follow these steps, taken from: https://forums.macrumors.com/threads/562018/
Written by TtOrMaMnY (thanks a lot dude, you helped me quite a bit)
Now, in that thread, he tells us to uninstall and install the Mobileinstalltion thing...however it didn't work for me, and my iPhone got stuck at the Apple logo...here's a more "fail-safe" way to go about doing it:
Once you've jailbroken you iphone, but you can't see installer or cyndia, download the 2.1 custom firmware (you should be able to find a link here: https://forums.macrumors.com/threads/562707/)
Uninstall iTunes 7.7 and Reinstall iTunes 8. Now sync your iPhone with iTunes, and shift +click on Restore and select the custom firmware. You won't get the Error (6) anymore and it will work.
That's it...
Follow these steps, taken from: https://forums.macrumors.com/threads/562018/
Written by TtOrMaMnY (thanks a lot dude, you helped me quite a bit)
2G/3G iPhone 2.1 jailbreak tutorial -by geeb
DISCLAIMER: May break thingz...here be dragonz. Blame phi|o
WINDOWS ONLY!!!
Download the 2.1 firmware:
for 3g:
http://appldnld.apple.com.edgesuite....6_Restore.ipsw
or for 2g:
http://appldnld.apple.com.edgesuite....6_Restore.ipsw
install itunes v8 (http://www.filehippo.com/download_itunes/) <-- all versions of itunes are there
Update the iphone with iTunes and make sure it is activated!
Uninstall iTunes v8
Uninstall Apple Mobile Device Support (From Add/Remove Programs in Control Panel)
Install itunes v7.7.*
Download quickpwn with the correct 2.1 bundle inside it http://xpwn.co.uk/quickpwn-2.1-2g-3g.rar
Run quickpwn...select your iPhone1,2_2.1_5F136_Restore.ipsw or iPhone1,1_2.1_5F136_Restore.ipsw
you can select cydia and installer and logos if you wish
When it is finished the phone will reboot...Cydia and Installer will NOT be visible
Now, in that thread, he tells us to uninstall and install the Mobileinstalltion thing...however it didn't work for me, and my iPhone got stuck at the Apple logo...here's a more "fail-safe" way to go about doing it:
Once you've jailbroken you iphone, but you can't see installer or cyndia, download the 2.1 custom firmware (you should be able to find a link here: https://forums.macrumors.com/threads/562707/)
Uninstall iTunes 7.7 and Reinstall iTunes 8. Now sync your iPhone with iTunes, and shift +click on Restore and select the custom firmware. You won't get the Error (6) anymore and it will work.
That's it...