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

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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