If you are on an older device (iPhone X or older), try re-running or Palera1n .

"iRemove Tools: A Critical Analysis of the 'Sorry, Your Device is Not Supported' Conundrum"

If you see “Sorry, your device is not supported” on an iPhone 11, the tool is telling you the truth. Don’t waste hours trying to fix it.

This message stops your workflow dead in its tracks. But what does it actually mean? Is your device permanently locked? Did you waste your money on a software license?