Tommy, according to this, the eMMC must be erased in order to boot from SD card. Did you manage to boot from SD card without wiping out the eMMC?
Anyway, I already erased it 
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Tommy, according to this, the eMMC must be erased in order to boot from SD card. Did you manage to boot from SD card without wiping out the eMMC?
Anyway, I already erased it