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FTP measure without power meter

Hi,
I've bought my  Edge 1040 7 days ago (22th of July).
I made some 3km slow test ride after mounting it.

Dont know why and how I got FTP result from this ride
while not having any power meter. I used only Garmin HRM-Pro.
See garmin connect screenshot below.
It says: "FTP ratio from bike ride  263W   22th of July"

Is it possible to make another FTP test? and how?