Make sure your phone is ready for fmi-off

Download the app and add serial or IMEI on this free checker 
DOWNLOAD iUNLOCK TOOL (MAC)

and click on app FMI OFF

and wait for the result on the server if supported you can add it for FMI OFF

HOW TO USE FMIOFF TOOL: 

1 - Register iosfiles.com go imei orders - go select free checker open menu iPhone/iPad, register your serial.

2 - Now on the device: 

- go to settings>icloud and turn green all functions including key-chain to ON

- Jailbreak your iPhone and iPad with checkra1n

if you JB with unc0ver also need (install dropbear and dropbearSSH)

- Remove any SIM inside 

- Enable airplane mode and wifi OFF unlock the screen and keep it

on before and during the process

- wait for 30s 

-open iunlock FMIOFF tool mac press FMIOFF

- check for the result ( if eligible or rejected )

- if eligible register your serial 

- Process again FMIOFF 

DONE check again your serial with IMEI or SN to make sure its OFF

- restore your device Done