Ok, i seem to have found a solution. Instead of redoing the whole jailbreaking over again, this is a timesaver too. Once seas0nPass has created the new jailbroken IPSW file, the’s no point letting it do the same (time consuming) thing all over again, since you’ve got the jailbroken firmware already. It’s just the uploading part that fails over and over again.
When i got the 1602 error again, this time i had ATV connected (only the USB cable, no power cord!) i manually restored the jailbroken IPSW file in iTunes. You can do this while holding the ALT button when clicking on the restore button in iTunes. This gives you the option to manually select the IPSW file you wish to upload.
You can find your jallbroken IPSW file in: user/library (his is an invisible file, that you need to make visible first)/application support/Seas0nPass/Firmware/
It worked for me, give it a try