Unable to Verify App
This usually means iOS cannot trust the app signature.
- Certificate revoked or expired
- Profile does not include the device UDID
- IPA signed with mismatched certificate files
- Old app build still installed on the device
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Fix iPhone IPA signing and verification errors
Use this page to identify whether your install problem is caused by a revoked certificate, wrong .p12 password, missing UDID, mismatched mobileprovision profile, or a broken IPA file.
Integrity Could Not Be Verified
This means the installed app package is not passing iOS verification.
- Wrong or revoked signing certificate
- Mobileprovision mismatch
- Damaged or incompatible IPA
- App needs to be signed again with current files
ESign certificate errors
ESign can import files but still fail if the active certificate entry is wrong.
- Import both the .p12 and .mobileprovision files
- Use the exact certificate password
- Select the correct certificate before signing
- Remove old revoked entries before retrying
Feather certificate errors
Feather needs the certificate, profile, and password to match each other.
- Wrong .p12 password causes signing failure
- Wrong profile causes install failure
- Missing UDID blocks the target device
- Revoked certificates require replacement files
When do you actually need new certificate files?
New files are likely needed
- Several IPAs fail with the same verification error
- Apps worked before and suddenly stopped verifying
- Your profile belongs to another device
- The certificate is expired or revoked
Try troubleshooting first
- Only one IPA fails but others install
- The IPA is old or incompatible with your iOS version
- You may have copied the password with an extra space
- The old failed app is still installed
CertDrop certificate package
CertDrop delivers the .p12 certificate, matching .mobileprovision profile, certificate password, and install/download page by email. The package is designed for compatible IPA signing workflows such as ESign, Feather, and online IPA signing.
Frequently asked questions
Why does my iPhone say Unable to Verify App?
Usually iOS cannot verify the signing certificate, the certificate was revoked, or the provisioning profile does not include the device UDID.
What does Integrity Could Not Be Verified mean?
It means iOS does not trust the installed app package. Common causes include revoked certificates, mismatched profiles, missing UDID, or a damaged IPA.
Can I fix ESign or Feather errors with CertDrop?
If the problem is caused by missing, revoked, expired, or mismatched certificate files, a fresh CertDrop certificate package can help.
What files do I need to sign an IPA?
You need the IPA, a .p12 certificate, the matching .mobileprovision profile, and the certificate password.