Upgrade Failure leads to Damage?

Hi,
I tried to upgrade the packages to 5.2.6 when suddenly, the electricity cut off during the booting time. Then, when I tried to turn it back on, the Interface Indicator lamps indicated nothing, and no device could connect to the router.

What should I do? Should I go to service center, or are there any other ways to fix this?

Thank You.

You should NetInstall, that will reformat the device.

But my device is RB750, it does not have serial port

There should be a way to get it to boot from the network… I think you hold the button on boot-up.

EVERY device has a method to do netinstall, even if they don’t have a serial port. The manual for each device describes the procedure. If they don’t have serial port, then unplug power, hold in reset button, while holding, plug in power, keep holding button for 30 seconds. Make sure to use the first eth port.