Trying to jail break my IPOD Touch 4G version 4.3.5 per the CYDIA's download instructions. But can not find the needed ".ipsw" file out of the CYDIA download of the "iPhone3,1_4.3.5_8L1_Restore.ipsw" zip folder. Although the Zip folder has .ipsw label, it is not a true .ipsw file that ITUNE's will recognize - ITUNES gave me an error message that it was an invalid file

Cant get past step 1 and 2 of CYDIA's jailbreak instructions found at link

Membership Login Page - iPhone Unlocker Pro

I put in a CYDIA problem ticket and it is going on 5 business days with no response from CYDIA to help me

Can some tell me what I am doing wrong?

Thank you,

John