I do not have the link anymore. Anyway, it said to get the last version of the system on an sd card, but it is not enough as the old bootloader from the eMMc would still be used. So it said to desactivate the bootloader
sudo dd if=/dev/zero of=/dev/mmcblk1 count=1 seek=1 bs=128k
Possibly it loses the contents of all partitions on the eMMC, I do not know.
If you need the EEPROM and do not want to use the sd card, you should instead update the eMMC. I guess you will find links for that.