For anyone who fails to upgrade the CSS106 to the latest version - try to load the backup firmware and then perform the manual upgrade. Before that, save your configuration in a backup file.

This method helped, thanks a lot. I apparently missed this text at the bottom of the page.

I can not upgrade a CSS106-1G-4P-1S unit. Anyone else with the same issue or is it just me? Manual or automatic upgrade does not work! I have the same problem :(. Pleaaase help. download file to local pc link https://download.mikrotik.com/swos2/css106/swos-css106-2.10.bin and get file from there /j...

I can not upgrade a CSS106-1G-4P-1S unit. Anyone else with the same issue or is it just me? Manual or automatic upgrade does not work!

I have the same problem . Pleaaase help.