iPod ipsw firmware download that provided by Apple, when you do the relevant operation at your own risk.
A1574
13E233 · iPod7,1
13D15 · iPod7,1
13C75 · iPod7,1
13B143 · iPod7,1
13A452 · iPod7,1
13A404 · iPod7,1
13A344 · iPod7,1
12H321 · iPod7,1
12H143 · iPod7,1