Tools like Broque Ramdisk Pro or the TFT Ramdisk Tool use ramdisks to back up activation tickets (to keep SIM functionality) or remove "iPhone Unavailable" screens.
What is a Ramdisk? A ramdisk (RAM disk) is a virtual disk drive that exists entirely in a device's volatile memory (RAM). It behaves like a conventional block device from the operating system’s perspective, but with much faster read/write speeds and no persistence across reboots. On iOS devices, early-boot components and recovery environments sometimes expose a ramdisk that can be used temporarily during diagnostics, firmware updates, or low-level operations. iphone xr ramdisk