my 2nd. generation ipod will not update the software from 2.2 to 4
my 2nd. geration ipod will not update the software from 2.2 to 4 or 6.
iPod touch, iOS 2.x
Are you sure you have a 2G? A 1G can only go to 2.1 via iTunes but a 1G can go as high as 3.1.3 that you get here:
Purchasing iOS 3.1 Software Update for iPod touch (1st generation)
To If you do have a 2G that can go to 4.2.1 by:
iTunes: Backing up, updating, and restoring iOS software
For 4.2.1 you need iTunes version 10.X and that requires OSX 105.8 or later.
If you have 10.4.11 you can only go to iOS 4.1 since that OSX can on go to iTunes 9.X