Hello
It works now.
I tryed to find older browsers, but without luck.
Instead i used EDGE (it could probably have been anybody) and took an old image 3.0.3, probaby from 2010/11.
It worked without problem, checksum was calculated in 10 seconds and after 2-3 minutes it was installed.
But the tuners was not recognized.
Dream-up and dreambox-image-dm800se-20170216.nfi (the newest i suppose). Bingo and I am happy again.
Thank you to "gutemine" for help
Poul