ipod touch 4 gen ios 4.3.5 (after reset) does not get new ios update
I have two 4th generation IPODs and could not run Skype, I tried upgrading the ios to 6.1.6 and had problem, thought to reset to setup it up from scratch and now it will upgrade at all, every time I connect one of the ipods to pc iTunes (version 12.1.2.27) says there is a need to update ios to version 6.1.6. I have tried to do the ios update 15 times now with all possible updates on pc and keeps coming up with the following message:
"There was a problem downloading the software for the iPod "name". An unknown error occurred 9006".
Does anyone have any idea about this? The software update always reach 640 MB/ 847.8 MB and stops.
many thanks in advance.