A little explanation for dummies as I if you have the same problem...here are the steps I've made:
1. Download a soft accessing the box (there are many, I 've used winscp)
2. access your box in ftp mode and enter the ip of your box. Standard login is root, no password so type just enter
3. download ci0.xml in etc/enigma2/ci0.xml on your computer
4. open with notepad editor, delete the lines including caid, save and export again to your box, overwriting the existing file.
5. Restart box and it's done