There are certain types of phones today and based on the bootloading two categories emerge – that allows you to unlock the bootloader and the others don’t.
Unlocking a bootloader helps you in rooting your phone and installing “read-only memory” commonly called the ROMs. However, doing so is a little challenging.
Manufacturers do not allow users to have control over this function or some have an external key unlock access that is available only with them.
In other cases, there are official websites of different phones that provide users with the key know-hows, how to install flashing custom ROMs. Since there exist tons of mobile manufacturers out in the market, we will provide some basic tips.
This article does not, however, guarantee that the particular method will suit your phone type. If it does not help, please reach out to the company manufacturers to provide you with suitable help.

There are many developers which we have enlisted below that can help you understand how to unlock – whether the official or unofficial way. Let’s take a look at them:
XDA Developers:
You can browse a section in this forum and check the category of unlocking ability – whether there is an official way to unlock or rooting method. If the phone supports an official way of unlocking, you can access the content through their direct websites. However, for unofficial unlocking, here are a few step:
1. Complete the backup before rooting
Rooting your phone will inevitably erase all data- everything from pictures to documents. It is important if you so want, to transfer them to your computer. Please also ensure to do the same with applications, say Whatsapp, going over and creating backup file settings and transferring them to the computer.
2. Install the Android SDK and Phone Driver

3. Enable the feature USB Debugging
4. Find/Have access to your unlock key

5. You can now Unlock your Phone
How to Unlock Bootloader on Android?
Conclusion
You have now unlocked the bootloader on your phone. It’s an easy and straightforward process. Go ahead and access all the custom rooting options, with the tools you’ve achieved with unlocking the bootloader.