The bootloader seems to be broken; it's not displaying any image, not even the recovery screen appears. I can't perform the "update.zip" process. I don't know if I need an original Firmware.img file to try and revive it with the Amlogic Burning Tool. I've seen it revived that way, but only with the original firmware.
I already tried that, but it's still the same. It turns on, but there's no image. It seems the bootloader is stuck. After pressing the reset button with a wooden stick for 15 seconds, the screen goes gray and still doesn't display an image. However, if I use any Linux image, such as "Armbian" or "Batocera," from the microSD card, it displays an image and works perfectly.