iOS 12.4.3 - Failed App Downloads/Updates

[SHL]

Hi. I just updated my iPad Air (1st Gen) to iOS 12.4.3 and noticed that all of the pre-installed apps including Facetime; Notes; Maps; Music; Voicememo etc cannot launch or update. 'Unable to download app - Facetime could not be downloaded at this time'

I've tried:
- Rebooting/resetting device
- Removing/reinstalling each app
- Signing out/in of App store
- Disabling all restrictions
- Resetting Wifi

Apps such as Whatsapp; Google Maps; Asphalt 9; Quik etc work fine.

Apparently once 12.4.3 is installed, iOS cannot be downgraded to an earlier version. Any suggestions?

 

[Mr Smooth]

Downloaded 12.4.3 a few weeks ago on my iPad Air first gen without any issues. Maybe try using iTunes?