Recover Firmware

The following section goes into detail of the firmware recovery process for Komikan when it does not boot any further than U-Boot. This can happen during an accidental shutdown during the firmware upgrade process or any corrupted system files. Some recovery methods will require LAN and serial access. Note: any configuration changes made previously will be cleared!

Recover via U-Boot

ATENTION! It is possible to brick your board while making changes inside the bootloader so make sure you are entering correct commands. If you make a mistake while typing use CTRL+C instead of backspace!

1. Install tftp server. 

 sudo apt-get install tftp-hpa

2. Connect to device via picocom. 

 picocom -b 115200 /dev/ttyUSB0

3. Reboot device and enter bootloader menu by pressing ESC several times while device boots.

4. Check for ip address. 

 ipconfig

5. Exit from picocom, return to PC shell. Press <CTRL+A> <CTRL+X> to exit from picocom.

6. Add address from the same subnet as device address. 

 sudo ip a a 192.168.1.5/24 dev eth2

7. Execute this recovery command. 

 tftp 192.168.1.6 -m binary -c put <firmware>

8. Enter picocom to check for upgrade process.