I can’t download app from my App Store
i can’t download iOS 14.oo
iOS 12.5.7 is the latest iOS security update for iPhone 5s / 6 / 6 Plus.
Go to Settings -> General -> Software Update -> Download and Install (if you haven't already done that).
iPhone 5s / 6 / 6 Plus can’t be update to a higher iOS (13 and later).
Yes, most apps require iOS 13.4 or later.
Considering a newer type of iPhone?
Read this before you buy a newer type iPhone.
For sure check your iPhone model & iOS version -> Go to: Settings -> General -> About.
See -> iPhone models compatible with iOS 12 -> iOS 16 -> iPhone models compatible with iOS 15.5 – Apple Support (UK)