The copter flew great with 3.3.3, no GPS errors whatsoever. I’ve upgraded to 3.4 to use the new MAV GPS mode with Raspberry Pi companion computer for my project, but I didn’t enable it yet, I just want to get it flying first.
As @OXINARF indicated RAW_DATA isn’t valid on a M8N, you need a Timing u-blox to enable it. If you look at the messages tab on the MP when you fail to arm you should see a more detailed message which tells you what part of the GPS configuration that failed.
Thanks for the reply! I’ll try @OXINARF’s solution on Monday and report back. Meanwhile I found out that the configuration check has been added recently (in RC6), so I just commented it out temporarily and had a couple of flights without crashes so far.
I cannot comment on flight quality yet as I changed a lot of parts on the quad and it’s 200g heavier now, so I need to do autotune again with the new firmware.
There is a solved button that you can use instead of changing of title. It is hidden behind the three dots. I marked my post as the solution, feel free to change it to another post if you want.