Download sony unlock bootloader. Pre-requisites: to unlock bootloader on sony xperia 1 (griffin), you need a laptop or pc supported models are j8110, j9110, and j8170; charge the xperia 1 to a sufficient battery level to avoid any sudden shutdowns during the process.
download sony unlock bootloader
It is only possible to unlock the bootloader for certain releasesto check if it is possible to unlock the bootloader of your device, follow these steps: in your device, open the dialer and enter *#*#7378423#*#* to access the service menu; tap service info > configuration > rooting statusif bootloader unlock allowed says yes, then you can continue with the next step.