I took a look at the
write_boot.sh file and it is expecting the drive where we want to change the uboot. So to call this script it is needed to type on the terminal the following commands:
So I edited the
write_boot.sh file to be like this:
sudo dd if=/dev/zero of=$1 bs=1024 seek=8 count=512 &&\
sudo dd if=u-boot-sunxi-with-spl_480272.bin of=$1 bs=1024 seek=8 &&\
chmod +x write_boot.sh
./write_boot.sh /dev/sdX where X is the drive number.
Everything should be OK after that.
I have also posted a comment on this tutorial so everyone that has problem can fix it.
I'll give a try once I get home.