how to update ios version 6.1.6 to 8.0.0

The 4th generation iPod Touch can not be upgraded beyond iOS 6.1.6.

Try following the steps here. https://support.apple.com/en-us/HT204204

Hi MichelPM. Sorry to tag on here, but you may have suggestions for this question, link: Does anyone have any recommendations for an app for an artist.

Per your other post, your iPod Touch is a 4th generation model and can't be upgraded past iOS 6.1.6.

Sorry.