Digi DR6420 MKII stop working during FTP firmware transfer

Hi, my digi DR6420 stop working and disconnect by itself while I was transfering the firmware to the router. Now i can’t get any reponse from the device, the device front panel led just keep blinking from left to right. How can i revive the device.



Does the unit boot up, i.e. do you see a flashing sequence of LEDs showing the boot process?

If not, it may be worth trying to recover the unit with Flashwriter, particularly using the “reset button” recovery method.