Raicya wrote: Sorry. It is possible to update iPhone 6S Plus to iOS 15. Here's an iPhone 6S just updated to iOS 15. iOS 12.5.4 is the latest iOS version for iPhone 5S , 6 & 6 Plus. I believe Niel's point is that if the phone shows as up-to-date with iOS 12.5.4, it is not, in fact, an iPhone 6S series but a 6. ( 0)
Connect your iPhone 6 to your computer using a Lightning cable. Open iTunes and select your iPhone from the device menu. Click on “Summary” and then click on “Check for Update.”. If iOS 13 is available, click on “Download and Update” to start the update process. Choose an iPhone. Download current and previous versions of Apple's iOS, iPadOS, watchOS, tvOS, audioOS and macOS firmware and receive notifications when new firmwares are released. zkXPJO. 68 34 176 224 352 187 74 6 215