Do not skip this section. Failing to prepare correctly can result in a bricked device.
Elias had downloaded the TWRP image file (usually named something like twrp.img) and placed it on his internal storage. Using the volume keys to navigate and the power button to select, he highlighted "Apply update from internal storage."
He selected the TWRP file.
The screen paused. The little android robot whirred. And then, a message appeared: "Installation aborted." android system recovery 3e install twrp
Elias tried again. "Installation aborted."
This is the most common chapter in the story of Recovery 3e and TWRP. Elias had made a classic beginner's mistake. He expected the Stock Recovery (3e) to agree to install a replacement for itself. It is programmed to verify digital signatures. TWRP is an unsigned, third-party tool. Asking Stock Recovery 3e to install TWRP is like asking a prison guard to unlock the cell doors for a stranger. It simply won't do it.
fastboot devices
Cause: Android encryption. Stock Android System Recovery 3e encrypts /data. Do not skip this section
Solution:
fastboot boot twrp-x.x.x-x-device.img
If this works, proceed to permanent install.
Elias stared at his Android tablet. It was a solid device, but the manufacturer had stopped updating it two years ago. He wanted to install a custom ROM to breathe new life into it, but to do that, he needed a custom recovery. Specifically, he needed TWRP (Team Win Recovery Project). Cause: Android encryption
He had read the tutorials. They all said the same thing: "Boot into recovery mode." Elias held the power button and the volume up key. The screen flickered, turned black, and then lit up with a familiar, stark interface.
There, in the center of the screen, was the text: Android System Recovery <3e>.
Beside it lay the iconic, fallen Android robot with a red exclamation mark. This was the stock recovery—the digital equivalent of a stern librarian. It was designed by the manufacturer to strictly follow the rules: apply official updates, wipe data if the phone misbehaved, and nothing else.