Xbox One elite controller constant blinking light and wont connect after disrupted...

was doing a controller firmware update when my controller disconnected from the charger causing the update to stop, leaving my Xbox home button flashing and controller unresponsive. Have changed the battery’s power cycled tried every reddit post about similar problems and no luck. Xbox logo proceeds to flash wether it’s plugged in or running off battery’s and the sync/pair button is also unresponsive. Any help is appreciated cheers

:)