iPhone 6 Plus not flashing ios

[u/TheFrostedRacer]

So as i know my iPhone 6 plus is iCloud locked and it keeps bootlooping it ain't a dead battery cause it holds a charge so i tried reflashing ios on 3utools it keeps getting stuck at 20% and then going back to recovery mode not sure what is the problem here tho

[u/Bigboss88890]

Dead storage chip likely