Already have iOS 12.3 officially hehe, come on brother.
Changes in iOS 12.3:
- Support for AirPlay 2, this is a new standard that is integrated in some TVs to support streaming images and audio directly from iPhone and iPad devices to TV without needing through Apple TV department
- Redesigned Apple TV application
- Download iOS 12.3 IPSW Files
- iPhone XS
- iPhone XS Max
- iPhone XR
- iPhone X
- iPhone 8 and iPhone 7
- iPhone 8 Plus and iPhone 7 Plus
- iPhone SE and iPhone 5s
- iPhone 6s and iPhone 6
- iPhone 6s Plus and iPhone 6 Plus
- iPad Pro (11-inch), iPad Pro (12.9-inch) (3rd generation)
- iPad Pro 10.5 and iPad Pro 12.9 (2nd-Generation)
- iPad 5 and iPad 6
- iPad mini 5 and iPad Air 3
- iPad mini 4, iPad Air 2, iPad mini 3
- iPad Pro 9.7-inch
- iPad Pro 12.9 (1st-Generation)
- iPad Air and iPad mini 2
- iPod touch