Is it possible to lock the bootloader without losing data?

Question

Is it possible to lock my phone without losing the system data it has? I had previously unlocked my Nexus 6p to get root access, and have since despised the big yellow warning sign reminding me that my device is unlocked every time I restart my phone. I have downloaded over a hundred apps as well as movies, music, and other files that I don't want to lose, so factory resetting is not an option. I am running Android 7.1.1 Nougat with a TWRP custom recovery.


— Devin Ersoy | Sources

Answer

On Nexus 6P the bootloader relocking method is contains the Factory Reset, there is nothing to do.



If you are trying to relock your device you should see a screen like this: image.



If you want to keep your files and data you should make a backup and when your device bootloader agian locked you restore it.



This is a normal behaviour but for example on OP2 there is a method to keep your data in save during the bootload relocking procedure.


— Bálint Babics | Sources

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