This method forces the box to boot from the SD card instead of its internal memory. YouTube

If your box is bricked, don’t throw it away. A $3 SD card and the "hot swap" trick just turned your e-waste back into a Kodi machine.

You can generally find firmware for these devices on community forums or via manufacturer links: For Amlogic Devices: Amlogic USB Burning Tool for PC-based flashing or Burn Card Maker to create a bootable SD card. For Rockchip Devices: RockChip Batch Tool 1.8 Android Tools to flash the Recovery Images: