hi!
this is what I get after step 3 (i have a 4gb sandisk micro sd hc 4 and used 2100 as <YOUR NUMBER IN MB>):

Checking that no-one is using this disk right now ...
OK

Disk /dev/mmcblk1: 124368 cylinders, 4 heads, 16 sectors/track
Old situation:
Units = mebibytes of 1048576 bytes, blocks of 1024 bytes, counting from 0

Device Boot Start End MiB #blocks Id System
/dev/mmcblk1p1 0+ 3886- 3887- 3979768 b W95 FAT32
/dev/mmcblk1p2 0 - 0 0 0 Empty
/dev/mmcblk1p3 0 - 0 0 0 Empty
/dev/mmcblk1p4 0 - 0 0 0 Empty
New situation:
Units = mebibytes of 1048576 bytes, blocks of 1024 bytes, counting from 0

Device Boot Start End MiB #blocks Id System
/dev/mmcblk1p1 0+ 2099 2100- 2150399+ c W95 FAT32 (LBA)
/dev/mmcblk1p2 2100 3886- 1787- 1829376 83 Linux
/dev/mmcblk1p3 0 - 0 0 0 Empty
/dev/mmcblk1p4 0 - 0 0 0 Empty
Warning: no primary partition is marked bootable (active)
This does not matter for LILO, but the DOS MBR will not boot this disk.
Successfully wrote the new partition table

Re-reading the partition table ...

If you created or changed a DOS partition, /dev/foo7, say, then use dd(1)
to zero the first 512 bytes: dd if=/dev/zero of=/dev/foo7 bs=512 count=1
(See fdisk(8).)
/home/user #

also, the yellow error message bar appears telling me format is not supported.

what should i do?
thank you!