Your computer must have a JAVA environment. The modified rom must be compressed into zip format, and then download the signature tool.

Open the signature tool and click Sign. An option will appear, click it.

There will be a dialog box after clicking, click to select.

Find the ROM you want to sign. There is a file selection type in the lower right corner of the window, select zip.

After selecting the ROM to be signed, click Sign Now, and a dialog box will appear. This dialog box prompts you for the location of the signed file. Here, add .zip at the end of the file name, and the file will be automatically saved. In zip format. After selecting, click Sign Now again.

It may show no response after clicking, please ignore it.

The signing time is a bit long when running for the first time, but the time will be shorter later.

In this way, the signature is completed and you can flash the phone.

The signature tool has been uploaded