Power flarm
You may have some luck with the Valley Soaring Association web site.
Peter Kelly wrote in depth step by step instructions for upgrading powerflarm and butterfly instruments and has the firmware links as well. It is written in blog form so you have to read quite a way down the page to find it.
Try this link or google valley soaring association.
Flarm is working on a new and improved website. Please stay tuned.
Rex Mayes
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