Problmes trying precision Landing with IR-Lock

@umbraclet16 wrote:

I want to use IR-Lock to achieve precision landing, but encountered a few problems.

1. I modified the default value of enabled and _type in ACPrecland to avoid modifying parameters on GCS. However,
   after I loaded my firmware, I found that PLND_ENABLED is still 0, i.e. disabled. But when I use another pixhawk, my firmware works. So, what could be the problem with the first pixhawk hardware?

2. After I set PLND_ENABLED and PLND_TYPE, MP hud displays 'Bad Vision Position'.
   Image may be NSFW.
   Clik here to view.
   This does not disppear when I connect Pixycam5 to pixhawk through I2C.
   I've tested that Pixycam works fine, and the i2c connection is accordant with ardupilot document.
   So what's the problem? Wrong pixycam firmware or something?

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