How can I set my GNSS back to GPS mode only?
For more Details why it might be required to Change the protocol, see here related FAQ.
If your application can not handle the latest generic GNSS device ID($GN**) and requires to receives ($GP**). You can configure the built in GNSS.
On a preloaded Windows go to c:\drivers\**_GPS\GPS_UTILITY_ALL_V8.01 and Launch the uCenter Utility. (Picture 1)
Very IMPORTANT! First step, click on Receiver-> Generation and select “u-blox M8”. If following tasks are performed with wrong generation setting, the GPS receiver can be damaged. (Picture 2)
Now click on COM port selection and choose COM3, the connection symbol will turn green and you will see available satellites in the status display on the right hand side. (Picture 3 and 4)
Choose Configuration View from the View menu. (Picture 5)
Select NMEA (NMEA Protocol) from the overview list on the left hand side, now click on the small lock symbol on the lower left corner, it will turn to an unlocked symbol. (Picture 6)
In the center section, change Main Talker ID to “1 - GP (GPS)” than click on the “send button” on the lower left corner, take care not to accidently hit the red x, it will reset the value to its previous setting. Now click the "Save Configuration" Button in the upper toolbar.
The line "CFG (Configutation)" will turn from gray into black and back to gray. (Picture 7 and 8)
To check if the setting was successful select Text Console from the View menu. You will see the raw NMEA sentences. The “RMC” message now should have a prefix like “$GPRMC” instead for “$GNRMC”. (Picture 9 and 10)
Now close u-center and setup your GNSS application to use COM 3 @9600 8,N,1