Install Twrp | Android System Recovery 3e

If you tell me your exact device model (manufacturer + model number) I will give the exact TWRP file name and any device-specific steps.

Then, once booted into TWRP, use “Install → Install Recovery Ramdisk” to permanently flash.

While Android System Recovery 3e provides some basic functionality, it has limitations, such as not allowing users to install custom ROMs or modifications.

He typed the command: adb reboot bootloader

This recovery is the "stock" environment provided by manufacturers. Its main functions include: the system. Applying updates

In short, Recovery 3e is designed only for official OTA updates and factory resets. It is the primary obstacle to customizing your device.