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Forerunner 245 very inaccurate GPS, always updating

My forerunner has been inaccruately tracking for well over 9 months now (I know this is my fault, I'm lazy). I finally got around attempting to fix it to no success.

I know how to code, so know my way around around a computer.

Symptoms

  • Always resetting with an update (yet I am on the latest update, at time of writing 11.60)
  • Inaccurate GPS every single use (for example it measured 52km measured for the Hamptons Marathon, 42km)
    • Sometimes way more innacruate than others, same run measures sometimes 2km, or sometimes 12 km (actual run length is 10km)
  • Everytime I start a run, it asks to reset to establish GPS connection (GPS connection never established after and inaccuracies remain)
  • In the About - GPS software version is 0.0.0.0

Attempted solutions

  • Obviously running the latest software
  • Factory reset and installed everything via USB plug-in
  • Resetting whenever request

Any help here would just be frigging wonderful.

Tom