How can i relock bootloader of infinix smart 2 with or without data loss? How can i relock bootloader of infinix smart 2 with or without data loss? i haven't install twrp and root device.
If you are sure that you have not made any modifications to the device, then the usual oem lock command should be all that you need to do:

fastboot oem lock-go


After that confirm the lock on the phone and you will be good to go.