An is a minimal, temporary file system loaded entirely into the device’s RAM. It does not persist after a reboot. Apple itself uses ramdisks during the iOS restore process. When you put your iPhone XR into DFU (Device Firmware Update) mode and connect to iTunes/Finder, Apple sends a ramdisk image to the device. This image contains the essential tools to erase, partition, or install the main iOS firmware.
Unlike the brute-force approach of old Android devices, ramdisks on iOS are risky: iphone xr ramdisk
Before diving into the "how," it is vital to understand that creating a ramdisk for a device you do not own is illegal in most jurisdictions. However, legitimate use cases include: An is a minimal, temporary file system loaded
If you are looking for iPhone XR compatibility, you generally have to look toward professional GSM tools. Community-favored options include: When you put your iPhone XR into DFU
For the iPhone XR, which is vulnerable to the bootrom exploit (A11 and below) but not to standard Checkm8 (A12 fixed the exploit), newer vulnerabilities like Blackbird (Checkra1n for A12 partial) or proprietary tools rely on ramdisks to reset the "iPhone Disabled" timer or remove 15-minute lockout periods.