To be honest I didn’t truly understand at first. Tho the idea is (if i understood correctly) to give the sonix board a false reading, by earthing a point off the board. forcing it to load from sd card.
As for some reason mine was refusing to read the sd card. I don’t know why tho, and I’m sure it’s not a common issue.
Let me study how to do PR. I will work on it. Another second hand SV got from eBay is showing the similar symptom. May not be popular but looks like not so rare either.
Satoru
Created PR https://github.com/ArduPilot/ardupilot_wiki/pull/1219. Hope I took correct steps.
My other SV mentioned above did not require this to fix. It was due to loose connector.
Saotru