# MAV_1_MODE not changing from Onboard on QGC

Source: https://forum.modalai.com/topic/359/mav_1_mode-not-changing-from-onboard-on-qgc
Category: General Questions (https://forum.modalai.com/category/2/general-questions)
Posted: 2021-07-27 21:49:25 UTC by Daniel Ryu
Replies: 1 · Views: 454

## Daniel Ryu · 2021-07-27 21:49:25 UTC

Hello, I am trying to establish a gimbal connection with mavlink according to https://docs.px4.io/master/en/peripherals/mavlink_peripherals.html, and I am trying to change the PX4 parameter MAV_1_Mode from Onboard to Normal. However, every time I try, the QGC immediately switches the mode back to Onboard. Is there a setting preventing this change? Rebooting is not effective. ![Screenshot from 2021-07-27 14-47-20.png](https://forum.modalai.com/assets/uploads/files/1627422556894-screenshot-from-2021-07-27-14-47-20.png)

## Reply by modaltb (ModalAI staff) · 2021-07-27 22:05:51 UTC

If you have an M500, it contains either a VOXL Flight, and there's an internal UART from the PX4 processor (STM32F7) to the Snapdragon processor running linux.

This is setup on MAV1, and if changed would halt comms between the two systems. 

https://github.com/PX4/PX4-Autopilot/blob/master/boards/modalai/fc-v1/init/rc.board_defaults#L23