Can't update JB iPhone 4 to 4.3.3?

[FinGerSoFuDgE]

Hi guys, after some quick advice as my iPhone 4 is currently stuck on the iTunes recovery mode

I was on 4.2.1 and planned on updating to 4.3.3 and then using Jailbreakme.com.
Backed up iPhone and transferred purchases etc, gone to update and I get a 1013 error.
Downloaded Tiny Umbrella and unchecked the 'Set hosts to Cydia on exit' as mentioned on this link: https://discussions.apple.com/message/15563643

Any ideas what I can do please??

[F3nom3ni]

Have you ever used the cydia servers to downgrade an iOS? If you have, you need to edit your host file and remove the extra line you put in.

[iYeow]

Uncheck from Tiny Umbrella will get rid of error 1013