Download the latest IPSW for the iPod touch 6 - iPod7,1 IPSW firmware files free download. You will be able to find both the signed version of iPod 6 touch IPSW firmware below as well as unsigned versions. Note that you can only restore signed IPSW with iTunes.
This is the iPod touch (6th generation) that was released on 15 July 2015. The model number on the back casing is A1574. The iPod touch (6th generation) makes use of the Apple A8 SoC, the same SoC as the Apple TV HD, HomePod, iPad mini 4, iPhone 6 and iPhone 6 Plus. The iPod touch 6 looks exactly the same as the previous generation except for the iPod Loop which has been removed. The colours have been replaced Slate becoming Space Gray, Lime becoming Gold, Salmon becoming Hot Pink and Turquoise becoming Blue. Silver and Product(RED) stayed the same.