ISO5 IPhone4 Error (21/1600) Restore Error

[GangsterAngel]

Hey guys, heres my problem.

i have a iphone 4.
Its Jailbroke. ( badly , Cydia apps dont install anymore always givs me errors)
I did my ipad the exact same way but that works :/ , Ahh well thats not really why im here.

i tried to install ISO5, i downloaded the Update/Restore File.
tried to install it through ITunes, it gave me unknown Error 1600.
3 Hours later , about 100 web pages and 7 Videos i finaly got rid of that error using "fixrecovery-win" , evryone said use "iREB-r4" , its ment to get rid of error messages when restoring and just skip them, with a lot of good reviews too but it was no use to me. the "fixrecovery-win" i used got rid of the 1600 error, now i get error 21 instead, Apple says this is due to Virus Protection, or a bad cabel. or slow USB Port........ Well i set up A ipod , this Phone , and 2 Ipads on it. so i dont realy think the wires / ports are the problem, and my Anti Virus is Disabled...

Anyone have a clue on howto Bypass/Fix Error 21 , or Install ISO5 without using itunes? ,,,,, and while your here anyone have a clue why i cant install cydia apps? - Please Help

 

[GangsterAngel]

Are you using the latest iTunes beta to do this? Also, is your device a registered developer device?

I'm not sure on what the error does but it's best to cover the basics just to make sure.

no and no, but u can install without DEV account and glitch past activation on the phone, dont think u can use it as a phone though, (SMS,Calls)