I have the iPhone 4 on 4.3.2 (01.59.00). I have the shsh files saved for 4.0.1 and up. Last week I updated to 4.3.2 with a small problem. The restore part went fine till the reboot. I got the "connect to iTunes" logo. TinyUmbrella wouldn't kick it out from that so I've put it to DFU mode and Jailbroke it with redsn0w. That took forever but it worked.

Now I tried to do the same thing with 4.3.3 and iTunes gives me error 21. I found Olethros' post about that error. Followed the tutorial with no luck. Still the same problem.
For the record I've tried restoring in dfu and recovery mode.

My question is can I try a regular update with TSS server running? I don't want lose the ability to unlock (I travel a lot + for selling purposes)

Thanks in advance

Have you tried putting your iPhone in pwned DFU to get past error 21? Simply launch redsn0w, select current firmware, select enter pwned dfu and follow instructions. About TinyUmbrella, you have to restore, not upgrade, take a look: The Firmware Umbrella - TinyUmbrella: Prevent iPhone4 Baseband Update

You were right, no error after pwned DFU restore but stuck in a recovery mode... Tried redsn0w, it did its thing but still couldn't get out off the recovery mode. It makes me think that there is something wrong with my phone. I went back to 4.3.2
Thank you anyways