A faulty USB cable can cause data transmission errors, making the tool think the device isn't registered because it can't read the ECID correctly. Use an original Apple MFi-certified cable.
If the LPro servers are down or undergoing maintenance, the tool may fail to verify your device's registration status. lpro aio ramdisk device not registered hot
Reinstall the tool and its associated drivers (usually found in an "iDevice" or "Driver" folder within the installation directory) to fix potential file corruption. Check Device Connection: A faulty USB cable can cause data transmission
: Manually put the device into Recovery or DFU mode before starting the process. lpro aio ramdisk device not registered hot