Continuous tone after loading V3.1-rc8 on PixHawk

I shouldn't have, I should've stayed with rc7 but I went to rc8. My PixHawk is now emitting a steady tone and my computer cannot recognize it when I try to connect. Anyone knows if I an manually load the firmware on the PixHawk?

Thanks

UPDATE:

I think I found it. I admit I'm a NOOB, but I think I got my system back up.

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  • More details...During the upgrade I was able to get to get to the point where I needed to restart the unit while depressing the safety button. Well during boot up, the confirmation tone was good until at the end where it just stayed on. I tried to cycle the power again and get the steady tone again. When I try to cycle the power with the safety button depressed I get the same thing. I thought I could try to reflash the system, but my computer complains that it does not recognize the USB device. 

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    Strangely, when I remove the sdcard, and reconnect to my computer I am able to terminal in through MP. Am I wrong to think that the card may have been mucked up? Does anyone know if it's possible to redo the sdcard? Any suggestions would be welcomed. Thank you

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