You are not the first person to encounter this problem, and you are probably not the last. For this reason, I also checked the relevant information. The reasons are as follows: "bes has an it policy called" No third-party applications ". If you enable this policy, you will receive this error (digital signature. Is invalid). Check the "disable third-party applications" entry in the IT policy. Obviously my company has formulated this policy, so I can't download third-party software to BB. "

Bess has turned on the function of prohibiting third-party programs from running. This is why all third-party programs can't run.

Later, netizens found a solution on the website of the State Council, which proved feasible in practice. The operation steps are as follows

1。 Select "Blackberry Internet Service" instead of "desktop forwarder" when installing the desktop manager; If you have chosen to install the Desktop Forwarder, please delete the Desktop Manager and reinstall it.

2。 Release policy. Bin file is placed in the installation directory of Desktop Manager. By default, it is C: \ program files \ research in motion \ blackberry;

3。 Go to Options-Security on BlackBerry, press the wheel and select Clear Handheld Device to clear all data in BlackBerry.

4。 Run Desktop Manager once, and then close it! Only in this way can the blackberry key be generated.

5。 Click Windows Start-Run, enter regedit to open the registry, find HKEY _ Current _ User \ Software \ Research in Motion \ Blackberry \ Policy Manager in the tree on the left, and right-click the Policy Manager folder. Select "new"-"string value", name it Path, and set the value to c: \ program files \ research in motion \ blackberry \ policy.bin.

6。 Open the Desktop Manager;

7。 Connect the blackberry.

8. Uninstall Desktop Manager

9。 Select the Desktop Forwarder method to install the Desktop Manager.

10. Select Chinese to install the software and confirm.

This method has been tried by many blackberry players, among which "hot glacier" has contributed a lot, and some people dare not forget it. I hereby nominate you as a token of my gratitude.