If you are using futurerestore , ensure your command includes the correct flags. If you are manually sending IBEC via idevicerestore , ensure you are using a version compiled with Pwned DFU support. For futurerestore , commands usually look like this: futurerestore -t blob.shsh2 --use-pwndfu --latest-sep --latest-baseband target.ipsw
The "Unable to write iBEC" error is a common headache for anyone trying to restore or jailbreak an iOS device using tools like 3uTools or idevicerestore . It basically means your computer and your iPhone/iPad had a "handshake" failure right as the bootloader was trying to load. unable to write ibec