First let me say this - Yes I've ran a search and ran one at google too with no answer so please help me. I'm trying to upgrade my 4.1 Iphone 4 with a 1.59 BB. I've downloaded the 4.2.1 IPSW and I started tss server on TinyUmb and ran the all business down like it should but after restoring & updating I always get a 1013 error or 21. I know killing TinyUmb will solve it but I HAVE too preserve my baseband. Any help please?