[Android General] G4stavoM1ster:
This is a quite lengthy tutorial, so pay close attention to the steps I'll mention below. Also, it's my first time creating a tutorial like this, so I apologize for any misinformation, and English is not my native language.

For this tutorial, we'll be using a patched version of Fastbootd (since our device doesn't have it by default).

So far, I've only managed to run 2 GSIs on my device, Android 14 DerpFest and Evolution X (don't ask me why), both maintained by KoysX, you can find them here: https://github.com/phhusson/treble_experimentations/wiki/Generic-System-Image-(GSI)-list (I recommend using Evolution X). Feel free to test other GSIs and leave a comment if you manage to get them to work without a bootloop (good luck).

By the way, does anyone know why most GSIs are not functional on this specific device? I would really like to know and would appreciate it if someone could answer me.

Keep in mind that I'm not a developer! I'm just sharing with you the experience I had to achieve the results I wanted with my current device.

Well, having said it all, first, make sure you have:

1. A functional PC (this method only works with a PC, duh);

2. A functional cable (obviously);

3. Unlocked Bootloader;

3. The Stock ROM of your device (mine's A145M);

4. Odin (https://odindownload.com/);

5. 7-Zip ZSTD (https://github.com/mcmilk/7-Zip-zstd | It needs to be this specific version);

6. ADB & Fastboot & its drivers (https://androidfilehost.com/?fid=6006931924117923181 | https://developer.android.com/studio/run/win-usb);

7. The downloaded GSI you want to flash on your device;

How to install the GSI:

1. Connect your device to your PC via the cable (ensure the Bootloader is already unlocked).

2. Enter your device's Download Mode and stay in it for now with the cable connected.

3. Extract the recovery.img.lz4 file from your device's Stock ROM (that can be found on the AP file of the Stock, just remove the .md5 extension from the end of the AP file, keeping only the .tar extension at the end) using 7-Zip.

4. Using 7-Zip again, extract the recovery.img file from the recovery.img.lz4 file (both have the same name but are "different"; this step is essential, we'll use the second file, not the first).

5. Now, you'll need to patch the previously extracted recovery.img file using this tool: https://github.com/physwizz/Patch-Recovery (the patching tutorial is on the link itself, thanks to @physwizz).

6. After patching, download the .tar file and open Odin, select "AP" as the option to put the freshly patched recovery file.

7. At the end of the process, your device will restart. While it's still connected via the cable, immediately press the power button and the volume up button to enter your device's Recovery Mode (now with Fastboot, as a consequence of the earlier patch).

8. With the volume buttons and the power button, select the "Enter fastboot" option.

9. Now, being in Fastboot, enter the following commands in order:

- fastboot erase userdata

- fastboot erase system

- fastboot flash system <path to your GSI>

- fastboot reboot

10. After this, your device will restart for the first time and prompt for a complete restoration. Just click to restore.

And that's it! If you've followed all the steps correctly, your device will boot into the GSI without any problems. Leave a like if I've helped you in any way.