Connect Dobbo to your computer using a usb-c cable while Dobbo is
powered off.
Power on Dobbo while holding both led buttons until they start
blinking red.
Press the preset button to enter firmware update mode.
If you are on Windows, go to the 'Device Manager', search for 'Universal Serial Bus' and select 'STM32 BOOTLOADER'. Right click and select 'update driver'.
Press the Connect button and select 'FS in DFU mode' from
the list.
Select the .bin file for your
batch number from the dropdown list.
Press Download and wait for the progress bars to finish.
Unplug the power and usb-c cables from Dobbo and perform a
factory reset.