If you are using a Custom Firmware (Snowbreeze is great) at 4.3.3 you must have the SHSH for 4.3.3 on your computer, if you want to use TinyUmbrella Server. SHSH for current firmware is easy to get as Apple will still send it to you. You can also let Apple Sign the current firmware instead if you want, but you will have to use TinyUmbrella Advanced Settings to Remove check mark regarding Cydia, because this is Blocking Apple from signing firmware or even sending SHSH to your computer.
The reason for the 1600 Error is that your iPhone is not truly in Pwned DFU Mode. Try again using those tools that put it into true Pwned DFU.
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Also be certain you are using Sn0wbreeze 2.7.3 to create the Custom 4.3.3 IPSW, and make sure you let it put your iPhone into Pwned DFU.
If you are using a Custom Firmware (Snowbreeze is great) at 4.3.3 you must have the SHSH for 4.3.3 on your computer, if you want to use TinyUmbrella Server. SHSH for current firmware is easy to get as Apple will still send it to you. You can also let Apple Sign the current firmware instead if you want, but you will have to use TinyUmbrella Advanced Settings to Remove check mark regarding Cydia, because this is Blocking Apple from signing firmware or even sending SHSH to your computer.
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The reason for the 1600 Error is that your iPhone is not truly in Pwned DFU Mode. Try again using those tools that put it into true Pwned DFU.
If you are using a Custom Firmware (Snowbreeze is great) at 4.3.3 you must have the SHSH for 4.3.3 on your computer, if you want to use TinyUmbrella Server. SHSH for current firmware is easy to get as Apple will still send it to you. You can also let Apple Sign the current firmware instead if you want, but you will have to use TinyUmbrella Advanced Settings to Remove check mark regarding Cydia, because this is Blocking Apple from signing firmware or even sending SHSH to your computer.