The A12 chip’s security makes it nearly impossible to run a permanently modified operating system. Any website offering an “iPhone XR custom IPSW download” is either:
YouTube videos titled "iOS 18 Custom Patched IPSW iPhone XR Download!!" are fake. They lead to link shorteners and fake file hosts. No real patched IPSW exists for recent iOS versions on the XR.
uses the A12 Bionic chip, which is to hardware-level exploits like "checkm8" that older iPhones (iPhone X and older) used for creating custom IPSWs.
If you search for this phrase on Google or forums, you will encounter:
✅ – Impossible without SHSH blobs, and even then, you can’t sign a custom IPSW. Apple stopped allowing that after iOS 6.
This was the moment where custom firmware usually failed, throwing a "Code 3194" error as Apple’s servers rejected the unauthorized code.