Part 2: Relock bootloader & Update firmware manually - YouTube
How to Lock the Bootloader on Android: 14 Steps (with Pictures)
How to Lock the Bootloader on Android: 14 Steps (with Pictures)
John Wu on Twitter: it is confirmed that for those who wants to re-lock their bootloader with self signed images(possible on Pixel devices), SafetyNet with HARDWARE-BACKED evaluation will still *NOT* pass CTS
How to lock Huawei bootloader (from RELOCKED to LOCKED)
How to Relock Bootloader of any Android Phone - Root Update
How to lock Huawei bootloader (from RELOCKED to LOCKED)
How to Relock Bootloader via Fastboot on Android
How to lock Huawei bootloader (from RELOCKED to LOCKED)