Downgrade from iOS 4.3.3 to 4.2.1 after an iOS 5 beta downgrade?

[Turnamental]

Just as it really states in the title...

I can't get my iphone 4 to downgrade from 4.3.3 ~ 4.2.1 after I downgraded it from iOS 5 ~ 4.3.3

iTunes 10.5 for iOS 5 ~ 4.3.3 (went fine)
iTunes 10.3 for 4.3.3 ~ 4.2.1 (no work either after 10.5 fail)

I get error (1) every time... I'm lost

I mean iOS 5 had to have changed something...

I downgraded this very iP4 from 4.3.3 ~ 4.2.1 before I had installed iOS5. Now afterwards it's a no go.

EDIT:

10 minutes later I get it...

1. Create a Custom ipsw in PwnageTool/SnowBreeze with the 4.2.1 firmware.

2. Put phone in DFU mode.

3. Run TinyUmbrella and start the TSS server.

4. Shift/Command + Click restore in iTunes and let it rip.

So I'm guessing that 4.2.1 won't jive with the 4.10.01 baseband... Errrr the error is when it's trying to install 3.10.01 over 4.10.01

By using PawnageTool custom firmware that step is passed over.

Hope this helps somebody

[Larzen23]

Hi. Did you set the Tiny umbrella Advanced tab to Cydia Server?