For Mac/Linux

Clone the following GitHub repo which includes a bootloader recovery and updater tool.
```
git clone https://github.com/xypron/JH71xx-tools/
```

Navigate to the cloned repo and build the tool.

cd JH71xx-tools
gcc -o jh7100-recover jh7100-recover.c

Copy JH7100_recovery_boot.bin, bootloader and ddr init to the JH71xx-tools directory.

Note: This step is not a must, but it makes it more convenient in the following steps when we point to the file locations.
Type the following in the terminal to view the connected serial devices.
```
dmesg | grep tty
```
Figure 1. Example Output
Type the following and it will wait for bootloader mode.
```
sudo ./jh7100-recover -D /dev/ttyUSB0 -r jh7100_recovery_boot.bin -b bootloader-JH7100-211102.bin.out -d ddrinit-2133-211102.bin.out
```
Figure 2. Example Output

Note: You may change the serial port according to yours and also the file locations if you haven't moved them into the JH71xx-tools directory.
Press on the BOOT button while turning on VisionFive to enter bootloader mode.

Figure 3. Pressing on the Boot Button

Example Result:
If you see the following output, you have successfully updated bootloader and ddr init.
Figure 4. Example Output