Sometimes it is necessary to re install an app. If you need to re install iCertifi and you have purchased Sync Restore you can retrieve your certificates by simply pressing restore in Settings > Cloud sync More info
Or
If you have not previously purchased Cloud sync you can restore your device to an iTunes or iCloud backup and your certificates will be restored. (Backup your files and settings to iCloud or iTunes before performing the restoration, if possible) Learn how to back up device here
Details on how to restore your device can be found here
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