red and blue solid lights on 3dr solo can someone help pls

Joined
Apr 28, 2021
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You could have an intermittent SD card socket, try reseating them, controller first, if no luck then copter.
If that doesn't help then:
Buy Solex from the playstore, if you're on android.
Use that to install Open Solo 4, seamlessly, effortlessly and free of charge to your controller and drone body.
I know this sounds glib, I apologize but it may be inevitable that you'll NEED Solex/Open Solo 4 anyway if you end up stuck in 3DR's obsolete Preflight Update mode.
 

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