iPhone 8 cannot download 15.7.1

If you have ONLY 6 GB that may not be enough. To update over the air from the phone all of these requirements must be met:

• YYou need at least 10 GB of free storage for iOS 16 or 6 GB for iOS 15 or lower; more is better
• You must be connected to a Wi-Fi network (and not a personal hotspot) unless it is an iPhone that supports cellular 5G (12, 13, 14 or SE 3rd edition) and has a 5G network connection
• The phone must be charged to at least 50%, and preferably plugged in so it stays above 50% during the update
• The phone must not be in Low Power Mode
• The phone must not be connected through VPN, and it may be necessary to delete any VPN apps and VPN profiles
• The phone cannot be in Airplane mode
• You cannot still have a beta version installed on the phone
• You cannot have a previous version that was downloaded, but not installed - go to Settings/General/iPhone Storage to look; if you find an iOS installer, delete it

If you can't meet all of them you can still update using your computer.

Hello~ Any help here?

If your iPhone or iPad won't update - Apple Support

~Katana-San~

Hello again ~ See *Lawrence Finch’s* excellent reply. Good luck.

~Katana-San~

Great, glad you resolved it. How much space to you have to free up?

Hello ~ Glad you are updated and enjoy.

~Katana-San~