After ROOT, you get the highest permissions, just like getting a super administrator on a computer! Because the manufacturer is afraid that you don’t understand the mobile phone system, it sets such a permission. Before your phone is rooted, you are using it as a user. You can only passively use some of its functions, or install some new programs without affecting the overall system. And what about after ROOT? You become a developer. That means you can edit this phone in depth. You can change the system of your phone. You can allocate the memory of your phone independently. You can also delete and uninstall the software that originally came with it. It is even said that the current Android system rooting is simply a matter of rooting your phone, and you can then modify the phone system in depth! The process of obtaining ROOT permissions for the phone

1. If the phone wants to be ROOT, the phone needs to be flashed first. Enter third-party RECOVERY

2. RECOVERY refers to a mode that can modify the internal data or system of the Android machine, also called engineering mode! Similar to the Windows PE or DOS environment of a computer! The built-in GHOST software also plays a role in system backup and restoration. Of course, you can also upgrade the kernel, apply patches, update software, etc.!

2. If you want to flash a third-party RECOVERY on your phone, you need to enter the online flash mode and connect it to the computer for online flashing

3. If you want to flash anything without an official digital signature on your phone, (such as ROOT package or third-party ROM, that is, anything other than official firmware), you need the BL permission of the mobile phone. Detailed introduction to the BL lock of the mobile phone

4. If the BL of the mobile phone is officially If locked, the phone cannot flash anything with an unofficial digital signature

5. For phones that are officially locked by BL, only by unlocking the BL first can they continue to flash third-party ROOT packages and third-party ROMs< /p>

Ideas of unlocking BL lock

TWRP is a kind of third-party RECOVERY & SUPERSU is a kind of ROOT package, so the key to whether the phone can be ROOT is that the BL of the phone cannot be locked. Only then can subsequent operations be carried out. Then the process of the official locking the BL and the mobile phone users unlocking the BL by themselves is called "unlocking" or "unlocking the BL"! The S7/S7E and S8/S8+ are also officially locked to BL by default. Therefore, if we want to flash third-party RECOVERY, we want to flash ROOT package or third-party ROM. You must first unlock the S7/S7E, S8/S8+ BL lock, and here comes the key. When unlocking the BL lock of S7/S7E and S8/S8+, the KNOX function that comes with the phone will change one of its own parameters. This change process is commonly known as fuse (trigger switch, physically fuse something). That is to say, once the phone is unlocked BL, the corresponding KNOX parameter will change, and this KNOX parameter cannot be restored, which is irreversible!

Unlocking and flashing results

When this KNOX parameter is changed, the known impact is that the Samsung PAY function will become invalid. As for the warranty, Samsung officially states that Samsung is not responsible for problems caused by unlocking BL! The early S7/S7E cannot use the front camera even after rooting! If you want to ROOT S7/S7E, S8/S8+, you need to change the KNOX parameters, and they cannot be restored.

This will cause Samsung PAY to become permanently invalid and the warranty to be uncertain, etc. ROOT should think twice!