[hovatek]

When trying to re-lock your bootloader, you might encounter the Image signed with key bad key error, especially after an unsigned / unofficial firmware had been flashed. In this example, I'll be using the Motorola E 6th. Gen (E6)

To re-lock your Motorola Bootloader

1. Use the Motorola Rescue and Smart Assistant tool to rescue (i.e flash signed firmware to) the device
   
2. Setup fastboot on the PC and boot the device into fastboot (Power off > Hold Power + Vol down together > Wait till it enters bootloader )
   
3. Copy the downloaded files from Motorola Rescue and Smart Assistant tool (LSMA) into the fastboot folder
   
4. Run the following commands in fastboot (you could create a batch file to auto run them). Ensure to check the firmware for the partitions and files flashed then make necessary edits
   

For Models without OEM partition

Code:

fastboot oem lock
fastboot oem lock
fastboot flash boot boot.img
fastboot oem lock

For Models with OEM Partition

Code:

fastboot oem lock
fastboot oem lock
fastboot oem lock
fastboot flash boot boot.img
fastboot flash system system.img_sparsechunk.0
fastboot flash system system.img_sparsechunk.1
fastboot flash system system.img_sparsechunk.2
fastboot flash system system.img_sparsechunk.3
fastboot flash system system.img_sparsechunk.4
fastboot flash system system.img_sparsechunk.5
fastboot flash system system.img_sparsechunk.6
fastboot flash system system.img_sparsechunk.7
fastboot flash system system.img_sparsechunk.8
fastboot flash system system.img_sparsechunk.9
fastboot flash vendor vendor.img
fastboot flash oem oem.img
fastboot oem lock

Your bootloader should now be locked