unable to lock bootloader moto g4 plus :-> XT1643

[papabanna]

I have moto g4 plus. recently i rooted it and everything worked fine
but when i applied the nougat ota upgrade
i m unable to downgrade it to mm stock ROM or stock ROM
neither, able to lock bootloader even cant flash with recovery
every time i flash it it shows "preflash validation failed " and "piv sign not valid " for the boot and recovery image

my stock ROM is not corrupt
one more thing it also display's "security version downgrade"

pls guys help me

 

[ong14]

1. enable developer option
2. enable oem unlock
3. get unlock code from motorola website
4. unlock via fastboot

Sorry, misread. I think you want to unlock BL.

 

[____Mdd]

Did you read XDA rules...? Did you search...?
There is already a thread for ReLock issue..

As you will read,
You can't downgrade bootloader if once updated...
Don't Mess with bootloader unless want a brick....

According to my views, there are no benefits for ReLocking unless want to sell phone and make buyer fool... LoL...