Best Bike Split and Garmin 520 Plus - How do I get this dang thing to work

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I reluctantly had to give up my Bolt for the 520 Plus, only for Varia radar. I’m really starting to hate the thing. I cannot get Best Bike Split power targets to work on here to save my life. I can’t even get the stupid Garmin Power files to stay saved in the folder. I’m about to throw this thing in the river, get my Bolt back, and just allow myself to get hit by cars with the lack of radar. Anyone using Best Bike Split power targets with the 520 plus successfully?