Do a "reset" by poking the reset button on the back of the reader with a paperclip, small nail, or whatever fits in there. That will, hopefully, bring your reader back to life.
Also, make sure your reader is well charged--I thought I "bricked" it when it behaved the same way as yours after I did the upgrade. But once I reset it, and put it into "charge" mode with the wall charger, it seemed to behave normally. And now that it's been fully charged I've experienced no other similar problems.
Good luck!
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