# My drone refuses to be armed

**URL:** <https://discuss.px4.io/t/my-drone-refuses-to-be-armed/11777>\
**Category:** Pixhawk\
**Created:** [July 4, 2019, 8:44am UTC](https://discuss.px4.io/t/my-drone-refuses-to-be-armed/11777 "2019-07-04T08:44:02Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Atlas12345](https://discuss.px4.io/letter_avatar_proxy/v4/letter/a/3e96dc/32.png) [@Atlas12345](https://discuss.px4.io/u/Atlas12345)\
**Post date:** [July 4, 2019, 8:44am UTC](https://discuss.px4.io/t/my-drone-refuses-to-be-armed/11777/1 "2019-07-04T08:44:02Z")

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Hello everyone  
I recently mounted a drone based pixhawk 4 (holybro) but today my drone refuses to arm and I really do not understand why.  
my drone was flying very well in 1.9.0 and it seems to me that the problem occurred following the update in 1.9.1 because I have not made a parameter change in-temp.  
I do not know what it can come from yet I searched the forum if solutions had been found on this kind of problem.

my gps seems to work:

 ![gps](https://discuss.px4.io/uploads/default/original/2X/a/a2c78aa5b6ad5d820d59ef688c5cdad8be73f247.png)

below the result of a ls /dev and a ms5611 start

 ![Annotation%202019-07-02%20212244](https://discuss.px4.io/uploads/default/original/2X/9/940614c1e06076911d120c54ce9731068cb2e4c6.png)

quoted qgroundcontrol software does not show me error

 ![qground](https://discuss.px4.io/uploads/default/original/2X/5/561ba85894da7354bfb8d2bcd7d839754b38954d.png)  
 ![qground2](https://discuss.px4.io/uploads/default/original/2X/3/357548d57960be3fa226800efe87f9ad9079afec.png)

in the logs I see 2 error  
[E] at :0 - “serialnmea: No known GPS device found. Specify the COM port via QT\_NMEA\_SERIAL\_PORT.”  
[E] at C:\projects\qgroundcontrol\src\PositionManager\PositionManager.cpp:139 - “QGCPositionManager error 1”

but I’m not sure my problem comes from there … because I’m not sure I understand the error messages either

looking for this or this QT\_NMEA\_SERIAL\_PORT parameter could be changed i have to try modified the serial port baudrate  
 ![gps_baud](https://discuss.px4.io/uploads/default/original/2X/2/203ba765569c41b7dbb5edfa2462399f8744aa82.png)

and when restarting qgroundcontrol displays the error below.

 ![crc](https://discuss.px4.io/uploads/default/original/2X/a/ac77caf9433ccb46713a0bf2978d607286dada97.png)

here are the logs. (rename log.pdf in log.txt to see it)  
[log.pdf](https://discuss.px4.io/uploads/default/original/2X/a/a076bc59b2f8eb2df21cc898d24917c9c7a63bfd.pdf) (3.2 MB)

If anyone could take a look at it and tell me why I can not arm my drone it would be nice!

thank you