Hi,
This is quite fortunate that I find your post. In fact my own sd card broke down completely and I am trying to resurrect my reader.
Regarding your question, from what I understood from different forums and videos, the os takes the SD card CID numer and if it is wrong (like when you copy everything to a new SD card) it simply won't boot.
Apparently there is a way to make a patch of the software so it would read this number from a file not from the card. If your old card is still alive and functional I can explain you in details.
I also have a question, how did you manage to boot your reader? When I copied the partition table and the files it did boot so I assumed that I have to install some bootloader or something.
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