This article explains how to renew an expired developer certificate for iPhone and iPad. The process is lengthy and starts with a Certificate Signing Request (CSR).
How to Renew Your iOS Distribution or Development Certificate on Apple
Apple doesn’t warn you when your certificate expires; you see an error message that there’s no valid profile installed on your iPad. Figuring out that it’s the developer certificate that’s expired is half the battle. The other half is setting up and binding a new certificate to your profiles correctly.
Follow these steps to get everything working properly again.
Open the Keychain Access application on your Mac. This is located in Applications > Utilities.
