Where are GPIOs of BC660K located?

[BitProgress]

The data sheet says:

GPIO × 4 (for QuecOpen® version, × 13)

Where can I find the exact pinout of the 13 GPIOs?

[herbert.pan-Q]

Quectel_BC660K-GL_QuecOpen_API_Reference_Manual_V1.0_Preliminary_20210628.pdf (673.1 KB)