All the credits to XDA Senior Member segv11 who has developed the tool named BootUnlocker which can be used for rooted nexus devices and lets you unlock and re lock your bootloader from within Android. It achieves this by directly modifying the entry on your param partition that represents the bootloader's lock state. So, while you can get into Android after unlocking the lock screen and use the tool to lock/unlock the bootloader at will without data loss, no one else will be able to bypass the lockscreen security and use the app for the purpose, and if they try to unlock the bootloader using fastboot, all your data will be securely wiped.
And the most important fact is that, your device should be rooted to use this tool. It will work regardless of whether you rooted it after unlocking the bootloader in the first place, or just used some toolkit or exploit for rooting without unlocking the bootloader.
Using this app is quite simple and easy just launch the app and it will ask you for root permissions that you should accept. Next it will tell you the current lock state of the device on top, followed by buttons labeled Lock and Unlock that do exactly what they say. Just tap the required option and the bootloader will be locked or unlocked instantly, without even requiring a reboot.
This app can be installed from Google Play Store free of cost.
Install BootUnlocker From Play Store
And the most important fact is that, your device should be rooted to use this tool. It will work regardless of whether you rooted it after unlocking the bootloader in the first place, or just used some toolkit or exploit for rooting without unlocking the bootloader.
Using this app is quite simple and easy just launch the app and it will ask you for root permissions that you should accept. Next it will tell you the current lock state of the device on top, followed by buttons labeled Lock and Unlock that do exactly what they say. Just tap the required option and the bootloader will be locked or unlocked instantly, without even requiring a reboot.
This app can be installed from Google Play Store free of cost.
Install BootUnlocker From Play Store
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