I'm getting close to downgrading as well, for the same reasons as you.
I've not downgraded before, but I have read that you can upgrade (so I'm guessing downgrade as well) by putting the firmware update in your reader's root directory and then performing the up/downgrade. Also you need to have it plugged in as if you're charging it.
Maybe wait for someone else to confirm that, though. I did upgrade my firmware originally by putting the firmware update in my root directory because I didn't have an SDHC card. It worked perfectly.
If you're going to do that, make sure you don't already have another firmware version in the same directory.
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