No need to altboot after replacing SD card. chances are SD card is corrupt instead of faulty so can be re-imaged.
PM me your email and i'll send you SD card image for this machine and win32 disk imager, you may need something like minitool partition wizard (free) to format the card first to make it readable by windows. Wouldn't hurt to have a spare card though, 4GB or 8GB will be fine.
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