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First, don't worry, you'll unbrick it.
If it is in an "updating firmware state" then you shouldn't bother checking what's on the drive.
Revision 0.0.0.0 means that you've successfully put it into recovery mode.
Now what's the problem with the updater? Did you use the one linked in the first post? (there is a special "300" one) Did you try to copy the updater to the reader? Well, if yes, that's wrong. You are supposed to run it on your PC, while your reader is connected to it?
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