Inkbird 306a WiFi failure?

Bought an inkbird 306a 6 months ago
Lost connection the other day (on app the device shows as offline)
Removed if from app with the intention to re add it but cannot get the connection mode light to flash. Have held the left hand button in for 3 seconds (and longer) have done the factory reset by holding the right hand button in as the device gets powered up and it did reset and all settings went back to defaults. Still can’t get the connecting button to flash.
As you don’t even move onto the next stage of apps and WiFi router until the device goes into pairing mode I assume this cannot be a fault in anything other than the actual Inkbird device can it? Anything else to try or is it now a non app controlled device for the rest of it’s life?