Someone can explain me this?

Hi

i'm trying to recompile the kernel of my kobo Glo, i prepare the environment and compiled creating uImage...

before try to flash, i removed the internal SD and made a backup with dd if=/dev/internal-sd of=backup.img bs=4M

then, i flashed the uImage
dd if=uImage of=/dev/internal-sd bs=512 seek=2048

...

when i put this into the Kobo, this not work.. ok, no problem i think... just return the image i have backuped... but it not works.. i spend all the day trying to recover the kobo and after a lot of trying (get uImage from the kobo 3.8.0 firmware package and the u-boot-mddr) and i have to erase the recovery and the rootfs partition and replace with contents of the backuped backup.img ...

alot of troubles...

someone can say me why this not works? maybe because bs=4M ?? i did something wrong??




after that, using the post to another thing... i'm needing to recompile the firmware just to change the console from ttymxc0 to tty0 (i need free ttymxc0 to use with an TTL bluetooth module), this is not working and i think its because the kernel console is running under the ttymxc0



thanks alot for any information