Failed to parse the universal signature:

1. Prepare the certificate and description file and the official website of the universal signature.

2. Use Safari to open the universal sign.

3. Click to install Universal Sign.

4. Import the certificate and description file (the password of the certificate purchased from up is generally 123456).

5. Import the certificate description file and ipa package into Universal Signature. This is true for all three files.

6. Click on the ipa package.

7. Wait until the ipa that you just signed and installed appears on the desktop.