# ekf2 problem

Source: https://forum.modalai.com/topic/316/ekf2-problem
Category: Flight Core and Legacy VOXL (https://forum.modalai.com/category/9/flight-core-and-legacy-voxl)
Tags: flight-deck
Posted: 2021-07-05 07:51:42 UTC by znn
Replies: 7 · Views: 1699

## znn · 2021-07-05 07:51:42 UTC

![ekf_invalid.png](https://forum.modalai.com/assets/uploads/files/1625470224523-ekf_invalid.png) 

Hi, I have an error with ekf2.
The local position data status is invalid.
I'm using PX4 version 1.11.
Does modified library with changes is necessary?

## Reply by modaltb (ModalAI staff) · 2021-07-06 16:01:01 UTC

@znn ,

Are you using the ModalAI PX4 "1.11.3-0.0.5" ?  https://docs.modalai.com/flight-core-firmware/#v111-change-log

Or from PX4 mainline?

## Reply by znn · 2021-07-07 04:32:34 UTC (in reply to modaltb)

@modaltb From PX4 mainline.
I used Qgroundcontrol and select the current stable release.

## Reply by znn · 2021-07-07 08:24:07 UTC (in reply to modaltb)

@modaltb I think the basic problem is on the internet.

I tried 
* opkg install voxl-suite

and I got opkg_download_backend fail error
![opkg_update_error.png](https://forum.modalai.com/assets/uploads/files/1625646114795-opkg_update_error.png) 

and with the following command
* ping www.modalai.com 

 the error comes up.
![ping_error.png](https://forum.modalai.com/assets/uploads/files/1625646094807-ping_error.png) 

Is the ekf2 problem related to this internet problem?
In some forum pages, the microhard radio has to be disable but i'm not using microhard.
Is there something i can do?

Here some additional info about VOXL.
![ifconfig.png](https://forum.modalai.com/assets/uploads/files/1625646216736-ifconfig.png)

## Reply by znn · 2021-07-07 08:29:18 UTC (in reply to znn)

@znn 
![voxlversion.png](https://forum.modalai.com/assets/uploads/files/1625646554786-voxlversion.png)

## Reply by Eric Katzfey (ModalAI staff) · 2021-07-07 15:34:48 UTC (in reply to znn)

@znn This looks like you are in "soft ap" mode on wifi. You need to be in station mode on wifi in order to get access to the network. https://docs.modalai.com/wifi-setup/#configure-station-mode

## Reply by znn · 2021-07-08 05:52:50 UTC (in reply to Eric Katzfey)

@Eric-Katzfey Thanks, but i've been tried with station mode so far. I'll check again. 

I think the RX part in wlan0 should not be zero, right?
![ifconfig2.png](https://forum.modalai.com/assets/uploads/files/1625722747402-ifconfig2.png) 

Thank you for the reply.

## Reply by znn · 2021-07-08 10:21:58 UTC (in reply to Eric Katzfey)

@Eric-Katzfey  The main cause was system image version. The internet problem has solved! 
now i'll try again the QGC setup.
Thanks a lot.