I've accidentally corrupted the original kernel that came with RK3188-SOM.
I've downloaded the latest NAND flash image RK3188_debian_3.0.36_NAND_release1.img. It works, but suprisingly, it does not contain the script to change screen mode and resolution and does not contain the /etc/olimex/kernel directory.
Can you please make available the complete version ?
I found the files in the SD image.