It is the reason for the boot partition verification of the Android system.

It means suppliers. What is stored in this folder are suppliers. I hope that the file images you see will have a partition verification every time you start the computer. When the system finds that its system has been modified by you, , when the software version is inconsistent with its internal image, it will flash you back to the built-in image version, so it will return to its original state as soon as you restart it.