Apple patches security issues (including zero-day exploit) in iOS 12.5.5 for devices which could not be updated to iOS 14.
Apple Support: About the security content of iOS 12.5.5
Reference: Apple Releases iOS 12.5.5 Update for Older iPhones With Fix for Zero-Day Exploit
Developer:Check apps on iOS 12.5.5 for possible compatibility issues.
QA engineer:Check apps for regressions.
PM/DM:Business as usual.
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