First, I would like to say that as far as I know, there are no upgrades available for the EuroLine 6632/6652!
If you do not know what you are doing, please do not try to change the firmware in your player. If it goes wrong, your player will be unusable!!!
If you would like some more information about the firmware in the 6632/6652, please look at the EuroLine 6620 firmware page, as the things that are written there also applies to the EuroLine 6632/6652.
If there will ever be an upgrade for the EuroLine 6632/6652, you will probably be able to upgrade the firmware in it by making a CD with the firmware binary on. I am not sure, but the binary file on the CD should probably be named BANK30.ROM.
These are the setting that can be used in Nero (v5.5.9.0) to make such a CD:
When the CD is ready and inserted into the EuroLine 6632/6652, and it will hopefully update its firmware automatically.
As I have not been able to test this, I cannot make any promises that this is the proper way to update these players. But as they are so similair to the EuroLine 6620/6650 / United 3151/3155, this method will hopefully work!