The first step was finished without any issue. The problem is that, after the first firmware upgrade, is not possible anymore to browser second file. When I click on "Install file" and I choose "Firmware upgrade" option button, the browse control used to submit the file is not visible!
Any ideas? I tried to clear browser cache... but this did not fix my issue.
N.b: The printer is working... but this area is comletely unusable.