Sorry! I didn't know that I was breaking rules

Thanks for your attention! beside Barry Allen I heard with new boot-loaders it is possible to install multi-images. I read that with second-stage boot-loaders it is possible. But the second-stage file extension was .deb and I couldn't install it each way. At the end I updated my image online but yet I don't know if the boot-loader is updated or again needs second-stage ( I was recommended to use CVS unstable for the first and so now it has been installed and updated)
Anyway multi-image is not so important for me and I prefer to have a good Image rather than multi-image with problems.
For choosing image I heard about Merlin, OpenATV, dream-elite and CVS stable. I think all of them are of OE 2.5. Beautiful menus, less freezing for Cccam channels and working without problem is important for me, and of-course ability to install plugins and Emulator. so what do you recommend?
Sorry for writing so much

Hi everybody! I recently bought dm520 and this is my first dreambox. I decided to ask you some basic questions. Because I don't want to flash my device later. My questions are:
1. does it make problem if I install more than one image on my dm520?
2. If it is ok, which version of bootloader can handle it?
3. which Images are better for the base?
4. If multi image is harmful, then which image do you recommend to install?