I haven't contact the Dutch engineer, instead I try to see if it was possible to do it myself before I call help.
I had to start as a noob in Linux.
The LKETC password was not the most diffecult part, the ghost files that replace any files you have change back to the original files every time
after a reboot are.
After I found out the password, I found an easier way to change the password, simply replace the file "shadow" with your own username and password.
This is a standaard Linux trick, so next time you run into a firmware that is locked and you have control over the SD card.
Backup the SD card and replace the password and username in the file "shadow" with your own password and username.
It takes only 5 minutes instead of hours.

All the LKETC firmware use CGminer 3.9.0, the only difference between them is the languages files.
The first versions only have Chinese, the later version have English added and the last version have also Russian.
The ghost files in the latest version is more trickier than in the first version.

https://www.dropbox.com/s/14a66jqudfjkulw/Dragon_192_168_1_101.7z

This is the latest firmware with all the languages files, I change all the LKETC logo with my own and added a password protected page that I have
learn here.
https://bitcointalk.org/index.php?topic=650114.msg7277745#msg7277745

The IP of the miner is 192.168.1.101
The username of the password protected page is admin, no password, you can change that when you SSH into the Raspberry Pi with PUTTY.
The Raspberry username is pi and the password is raspberry.
Once you are logged into the Raspberry.

su root
cd /var/www
nano passwordprotect.php
Change your username and password and save it by pressing Ctrl+x

I want to write a tutorial how you can replace the ghost files with your own customize files and logo, but I am afraid I am too busy to do that
at this moment.