Apple just made it harder to restore these older iPhones and iPads: Check full list

Apple has discontinued the ability to restore or reinstall older iOS versions on several older devices, including the iPhone ...
Gadget Review on MSN

Apple Ends Restores for iPhone 5c, iPad Mini, and Other Legacy Devices

Apple stopped signing baseband firmware for iPhone 5c, 4S, and legacy iPads, making iTunes restores permanently impossible on ...
Mactrast

Apple Just Stopped Signing iOS and iPadOS Versions For These Older iPhones and iPads (UPDATE: RESTORED!)

Apple has stopped signing several older versions of iOS and iPadOS on older models of the iPhone and iPad, respectively.

Older iPhones and iPads: Apple secretly removes restore option

Anyone who owns an iPhone 4 or an iPad 2 has long been unable to use newer operating systems. But now Apple is even blocking ...