What is a Bootloader?
A bootloader common in every Android device basically instructs the operating system kernel to boot as per instructions. While Android being an open source platform and thousands of devices available for it yet the Bootloaders from every Manufacturer are kinda different due to the hardware supportive drivers.
Why Is Bootloader Locked?
As simple as that the Manufacturers dont want the end-user to switch to other Os and mainly stick to Android Os as the device was especially designed for that. In order to apply this concept, manufacturers lock the bootloader. Some developers say that its a warranty key and mean while you unlock the bootloader Company is no more responsible for warranty.
Why To Unlock Bootloader On Android Devices?
Unlocking Bootloader is a concept fo rooting, flashing Custom ROM . In simple terms Unlocking the bootloader allows you to install custom Firmware on your Android phone and making the utmost use of your Android Device.
Warning: Unlocking your phone’s bootloader may voids warranty. It also formats your Android phone’s internal memory and all the stuff you previously had on it.
Instructins for Unlocking Nexus 5 Bootloader
*You need to have Adb & Fastboot drivers so that you can use adb and fastboot commands. There are countless tutorials around for getting this setup, but it’s really not that difficult any longer to get this up and running. Simply download the adb & fastboot drivers. Any of the method.
1. Go to Settings>About Phone>Build Number(tap until it turns on developer option)
2. Check Usb Debugging Option from the Developer Options.
3. Plug your phone into your computer.
4. Check “Always Allow” and click Ok.
5. Now Open Command Prompt from the Start menu. And type the Following commands accordingly…
adb reboot bootloader
6. Once the above screen appears, type:
fastboot oem unlock
10. Tap ‘start’ on the phone to Reboot.
11. A factory reset will then take place.
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12. If everything went well you should see an unlock icon at the boot time.