对于19系列和L7系列：
请从我们的网站下载与你的矿机型号及控制板类型（Xilinx、Amlogic、BB、Cvitek）相对应的SD卡恢复镜像。（旧版本固件)对于L9系列：
必须使用恢复镜像刷入原厂固件。请下载适用于L9系列的解锁恢复镜像（Unlock L9）。该压缩包中包含了适用于T21 Amlogic和Cvitek控制板的镜像。对于21系列：
请下载适用于21系列的原厂恢复镜像（2024年2月版本）。- 对于21系列，请使用适用于S21、T21（Amlogic和Cvitek）以及S21 Hydro的2024年2月版本的SD镜像。
- 对于Amlogic控制板的S21+、S21pro、S21xp、S21_imm 和 S21xp_imm 机型，请使用S19xp的SD镜像。
- 对于Xilinx控制板的S21+ Hydro、S21xp Hydro 和 T21机型，请使用S21 Hydro的SD镜像。
恢复镜像安装指南
1. 使用最大容量为32GB、格式为FAT32的USB闪存盘或SD卡。对于 **AMLOGIC 控制板**，建议使用带有 OTG 转接器的USB闪存盘。2. 将与你控制板类型对应的镜像压缩包解压到USB闪存盘或SD卡的根目录。
3. 将SD卡插入或通过OTG转接器连接USB闪存盘到已断电的矿机上。
4. 给矿机上电，等待前面板上的绿色LED灯亮起并保持常亮，表示固件刷写已完成（通常不超过一分钟）。
5. 关闭矿机电源，取出SD卡或带OTG转接器的USB闪存盘。
6. 重新开启矿机电源，等待启动完成后，即可安装Byteon固件。
*建议在安装完成后，使用 TOOLKIT 将 Byteon 固件直接刷入矿机的控制板中，而无需使用 SD 卡。
Guide to Downgrading Stock Firmware after Feb.2024
For 19/L7 series:
Download the SD recovery image corresponding to your miner model and control board type (Xilinx, Amlogic, BB, Cvitek) from our website .
For 21 series:
Download the Bitmain stock recovery image for 21 series (dated February 2024). [2024_unlock]
- For the 21s series you need to use the sd image for S21, T21(amlogic, cvitek) and S21hydro from February 2024.
- For Amlogic S21+/S21pro/S21xp/S21_imm/S21xp_imm models you need to use the sd image from S19xp.
- For Xilinx S21+hydro, S21xphydro, and T21 models you need to use the sd image from S21Hydro.
For L9 series:
It is important to flash stock firmware using recovery image, download unlock L9_recovery images for L9. The archive contains images from T21 amlogic and cvitek control boards.
Recovery Image Installation Guide
1. Use a USB flash drive or SD card (max. 32GB) formatted to FAT32. For AMLOGIC control boards, a USB flash drive with an OTG adapter is recommended.2. Extract the archive for your control board type to the root directory of the USB flash drive or SD card.
3. Insert the SD card or connect the OTG adapter with the USB flash drive to the powered-off miner.
4. Power on the miner and wait until the green LED on the front panel lights up and remains steady, indicating the firmware process has completed (typically under one minute).
5. Turn off the miner, remove the SD card or OTG adapter with the flash drive.
6. Turn on the miner’s power and wait for it to boot, then you can install Byteon firmware.
*It is adviced that once installed, flash the Byteon firmware using the Byteon TOOLKIT directly into the miner’s NAND without an SD card.