Yes, the PRS-300 has similar buttons to the 505.
I was reading a calibre-created version of "The Atlantic" magazine in LRF format, and something in the document sent my 300 into an auto-reboot loop.
Pressing the "0" and the Down arrow broke the cycle, and also wiped the device memory so I had to re-load all my documents.
I didn't re-load "The Atlantic" again on the 300 for obvious reasons, but I was able to read it fine on my 505.
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