Happy New Year Step 1: Install a free signature Step 2: Import a certificate (. Cer) and key (. Key) to the C disk or E disk of the mobile phone. Step 3: Open the newly installed free signature, and click Options to enter the settings. (Figure 1) Figure 1 Step 4: Move the cursor to the signature certificate item, click to enter the disk selection interface, select the disk where the certificate was just imported, and enter the tea tray to find the certificate. Cer file. (Figure 2) Figure 2 Step 5: Move the cursor to the option of the signature key, just like Step 4! (Figure 3) Figure 3 Step 6: Setup is complete! Start signing. Click "Add Task" to find the disk where you downloaded the software, and choose to sign the signed software. Be careful to choose signature instead of self-signature. That's the usage of free signature. I hope you newcomers can understand how to use free signature. Have fun playing computer games! Problems in software installation and use: 1. Solution: If this prompt appears, it means that the software has been signed and used by others. Just remove the signature and re-sign. 2. Solution of "certificate expired/certificate not yet effective" during installation: If such a prompt appears, it means that the certificate of the software has expired or not yet effective. Just adjust the mobile phone event according to the prompt. If the prompt expires, adjust the time forward, otherwise adjust it back (try it yourself more or less) and re-sign the software. 3. During installation, the message "Cannot check the validity of the certificate online, please check the settings" appears. Solution: This prompt indicates that there is something wrong with your mobile phone settings. Please reset as follows: Settings-Applications-Program Management-Software Installation (All)-Online Certificate Check (Off). 4. At the time of installation, the required program access rights were not granted. Solution: ① The authority required by the software is too high to satisfy the certificate authority. Open the visa-free patch and you can install it (XX is required). ② The certificate authority in the software is too high, so it can be installed by removing the signature and re-signing it with a personal certificate. 5. "File corruption" occurred during installation. Solution: This prompt appears during installation, indicating that the file cannot be used. Please try downloading it again elsewhere. 6. Solution to "inconvenient" installation: Don't worry, just continue, most software will have this prompt when installing. 7. Protected applications provided by untrusted providers cannot be installed. Solution: The solution is the same as above (Question 6). 8. Solution: ① The software may be damaged, so you can try to download and install it again in other posts. ② The old version of the software is installed in the mobile phone. Delete the old version and reinstall the latest version. 9. Solution to "update error" during installation: When this prompt appears, you can confirm that other versions of the software are installed in the mobile phone, just delete the other versions and reinstall the latest version. This article is reproduced from:/