ILO update 1.16 to 1.55 fails - use 1.28 as intermediate version

Just tried to update ILO3 on a HP DL 380 G7 from version 1.16 (Dec 17 2010) to one of the latest version 1.55 (Feb 19 2013) but got the following error message in the browser:

The last firmware update attempt was not successful. Ready for the next update. 

download version 1.28