Problem with volume down button, Fuze+

Hi,

I just bought a sansa fuze+.
Everything was working fine when I tried the player.
Then I installed Rockbox, and now the volume down button is not working. It seems really strange to me that it may be the fault of Rockbox, but then the button was working fine on the OF.

And now I cannot boot to the OF, because the button volume down is not working and should be pressed during the boot.
I tried removing Rockbox, and copying the original firmware on the root directory, but I get a file not found, and I don't see how I will resolve this problem...
Is there any way for me to check it's really a hardware problem totally unrelated to Rockbox ?

Thank you for your help.
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