Restoring APM 2.7

I'm setting up my APM on a bumblebee carbon fiber frame. I have discovered that the 2.7 firmware works fine with the frame and I am currently running 2.9.1. I would like to restore to the 2.7 firmware. In the firmware tab when I click on pick previous firmware I get a list of numbers and symbols.Am I going through the right process of restoring the firmware or is there another way. 

Thanks

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