Hello ERmorel,
thanks but sadly it does not help.
No where on that page I can find the version of the newest firmware.
And regarding to following posting: *No Update Possible … *
I am familiar with the how it should be done, but sadly it does not work these ways.
And regarding your link, the page with description of how to do a manual update is not available at the moment! 
I would like to do an update within the system, but with the correct firmwareupdate as *.deb file I could do a dd of rootfs.img way easier than fixing the md5sum not working properly problem.
YES I did multiple correct downloads.
YES I tested the md5sum
NO md5sum in updateFirmwareFromFile.sh is returning empty string therefor the resulting error in update process.
Still open Question:
What is the version number of latest firmware-update?
thanks a lot.
