Good News: I was been able to recover the camera!!
I have first sent the camera to the official Canon lab in my country (Israel) with no luck - they said they need to replace the whole electronic circuit (with a cost of a new camera).
So I have downloaded a boot file called Portable ROM dumper from the Magiclauntem site, copied to the sd card (after formating in PC) and loaded it to the camera. This make the camera to write in screen the software version and so on, but especially it enabled the camera to understand that the current version which is installed is broken.
Afterwards, I have used the normal canon version file (delete the sd card and copy it) and then inserting to the camera and the upgrade process have successfully ended.
The difference in the upgrade screen now (after using the Portable ROM dumper) was that now the upgrade said it is from version 0.0.0 to 1.0.3, where beforehand it was 1.0.2->1.0.3
[removed link per Community Guidelines]
