Problem booting from sd-card

[giel]

I tried another pinebook image from wiki.pine64.org (xenial mate simple...)
This is what I did:
smitsg@smitsg-pc:/data$ sudo umount -f /dev/mmcblk1*
[sudo] password for smitsg:
umount: /dev/mmcblk1: not mounted.
umount: /dev/mmcblk1p1: not mounted.
smitsg@smitsg-pc:/data$ sudo dd bs=30M if=simple-image-pinebook1080p-0.7.28.img of=/dev/mmcblk1
0+1 records in
0+1 records out
12587008 bytes (13 MB, 12 MiB) copied, 2.43098 s, 5.2 MB/s
smitsg@smitsg-pc:/data$
And after reboot: blank screen

I think have to buy another sd-card...... Or should I use bs=1M?