3uTools servers are located primarily in China. If your ISP has poor routing to Asia, the ramdisk download may be truncated.
This is the simplest fix and often works if the ramdisk download was interrupted. error unable to load restore ramdisk 3utools full
Always keep a verified, working original Apple USB-A to Lightning cable specifically for flashing. It is the single most effective insurance against ramdisk loading errors. 3uTools servers are located primarily in China
Ensure the device has at least 50% charge. A weak battery can cause the device to "brown out" during the high-power ramdisk loading phase. error unable to load restore ramdisk 3utools full
until the Apple logo appears while keeping the device connected Change Firmware: