Antminer stock firmware

Tutorial for installing stock firmware using recovery sd images (amlogic, xilinx, beagle bone, cvitek control boards):

You must use a usb flash drive or SD card with a capacity of up to 32GB and must format it in FAT32 format. It is recommended to use OTG usb adapter for AMLOGIC control boards instead of a otg sd adapter.
Download the sd recovery image for your miner model and control board type and transfer files from the archive into the root of the usb flash drive or SD card.
Connect an SD card or OTG adapter to the turned off miner .
Turn on the power of the miner and wait for the green LED on the front panel to light up (and remain constantly lit). This will mean that the firmware process was completed successfully. This process takes no more than one minute.
Turn off the power of the miner and remove the SD card or OTG adapter with a flash drive from the control board.
Turn on the power of the miner and wait for it to load, the firmware should be changed.

Asic model