Is there a way to lock the bootloader?

[dave852]

I see plenty of guides on how to unlock the bootloader which as I understand voids the warranty. Is there any way to relock the bootloader if I need to? Maybe someone could link me to a guide?

I've had bad experiences with dodgy solder in 3 LG G4 handsets so I sort of see the value in a manufacturer's warranty these days.

 

[BadWolfYe]

In fastboot
"Fastboot oem relock YourCode"

 

[gm007]

Fastboot relock still show that the phone was unlocked before but to revert to original state you have to flash stock firmware using this guide https://forum.xda-developers.com/mate-9/how-to/guide-rebrand-chinese-al00-mate9-to-t3554656/page57
This will lock the bootloader without any trace

 

[dave852]

Many many thanks.

 

[pepe_lodz]

Fastboot relock still show that the phone was unlocked before but to revert to original state you have to flash stock firmware using this guide https://forum.xda-developers.com/mate-9/how-to/guide-rebrand-chinese-al00-mate9-to-t3554656/page57
This will lock the bootloader without any trace

Hi can you write me step by step how lock again bootloader becuase i read this link and i dont know how. Please.

I want debrand my P10 to clear soft Huawei and again lock boot loader to have full warranty. please help me

 

[camelboots]

Fastboot relock still show that the phone was unlocked before but to revert to original state you have to flash stock firmware using this guide https://forum.xda-developers.com/mate-9/how-to/guide-rebrand-chinese-al00-mate9-to-t3554656/page57
This will lock the bootloader without any trace

Is the adb relock bootloader "Code" command connected with a factory reset? Do I keep my data?