: It doesn't require a login or complex Linux commands; it boots directly into the checkra1n interface.
The checkn1x ISO relies on the unpatchable checkm8 bootrom exploit. It works on the following devices, regardless of iOS version (up to the limit of the bundled checkra1n version): checkn1x-1.0.6-amd64.iso download
No. Never do an OTA (Over-The-Air) update on a jailbroken device. You will lose the jailbreak and potentially bootloop. Restore via iTunes/Finder if you want to update. : It doesn't require a login or complex