A320NX and FBW A320 External model lost

Go to
Officlal > OneStore folder
Delete flybywire-aircraft-a320-neo from onestore folder or delete via content manager.
image

Go to

c:\Users\YourUserName\AppData\Local\Packages\Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalState\packages\

//steam // appdata > roaming > microsoft flight simulator > packages

Delete folder named flybywire-aircraft-a320-neo

Go to community folder
Delete folder named flybywire-aircraft-a320-neo and all liveries

Download and install latest dev version or experimental via FBW installer.
https://flybywiresim.com/

After that launch msfs and select Flybywire simulations A320neo