App crashed when certificates where deleted and device management option disappeared on device where app was previously installed.
app crashed when certificates where deleted and even device management option disappeared on perviously installed device.
Sounds like it is working as expected. If you delete an active certificate, any app that was signed using that certificate should stop working, and the certeficate should be removed from device. If the certificate no longer exists, it is not possible to verify the app was signed properly.
Any alternative method to make previous version app work properly.
I'm pretty sure your only option at this point is to create a new distribution profile with your new certificate and recompile / archive / distribute the app.
I have create new certificates but previously installed apps on user device are been crashed so how to stop app from crashing.
As I mentioned above, you will have to create a new distribution profile (or let Xcode create one automatically). If you are using an MDM system, it may be able to push the new distribution profile to the devices (it depends on which MDM system you are using - you'll have to investigate). Otherwise, you'll have to compile and archive the app again and reinstall it.