A major turning point occurred in September 2021, when the widely used DST Root CA X3 certificate expired. Modern operating systems received automatic updates to recognize the newer ISRG Root X1 certificate. Legacy iOS devices, long abandoned by Apple software updates, did not. Consequently, these devices stopped trusting a massive percentage of the modern internet. The SHA-1 to SHA-2 Transition
When the prompt appears, tap Install in the top right corner, confirm through the iOS security prompts, and tap Done . cydia.invoxiplaygames.uk certificates