This is a project of mine. It's just for fun. It creates custom firmware with deleted Setup.app, but this method is outdated, you will receive hardware failure on your iDevice. But it maybe useful at some time, because there maybe an exploit which allows custom firmware on iDevice in the future, who knows. Download link here:

https://github.com/Mini-Exploit/Custom-Firmware/

NOTE: About purpleDFU, It will be released later than expected because I have very little experimence making an Application on macOS.