I have an XPS 13 9350, <Service Tag removed>, which called for a firmware update at a time when the battery was low. I made the mistake of letting it go ahead, first checking the mains power was connected. Unfortunately the cable going into the power supply was loose and got disconnected at sometime during the firmware update. When I came back to the computer, reconnected the power, it was completely dead. None of the firmware recovery techniques would work, no lights came on. Any hope of recovering the motherboard?
I'm sorry to hear about the situation.
Let me look into this and help you towards the resolution.
My name is Khalander, your dedicated support assistant.
Before we proceed, could you share the below information for verification purposes?
I'd request you to try the steps given in the below video and let us know how it results.