I had emmc flashing errors once, too but found out that crossflashing the kernel helped me fixing it. See here: http://talk.maemo.org/showthread.php...592#post975592 Maybe it'll help.
Basically it's flashing Firmware 1.3, then flashing --only kernel from PR1.2, flashing EMMC from PR1.3 and finally flashing kernel from PR1.3 back (or reflash the whole PR1.3 from 1st step will do it too)

Greetz,

..::J4ZZ::..