Ok guys here's the story from A-Z I just received a second hand iPhone 2G. It used to be jailbroken, but the owner accidentally updated to 2.2.1 and it is now screwed up. It doesn't have the original Sim card anymore. Which means whenever i connect it to iTunes i get a message along the lines of: 'the sim card inserted in this iphone does not appear to be supported' I thought it would be a case of just putting it into dfu mode, restoring by option-clicking and choosing an ipsw that i used for my previous iPhone (which contained the custom 2.2 FW i made with Pwnage Tool). However, every time i tried to restore i got error-21. After a lot of research i found out that you had to delete all traces of iTunes and re-instal it. (I also installed an old version, 7.7) (http://www.modmyi.com/forums/general/433201-problems-dfu-itunes-8-0-2-error-21-fw-2-2-a.html) I did this. No luck. I don't have the original Sim card, and the main problem is getting rid of the error-21. So please, help!