[JeanLuke]

Most of those chips are Bosch specials. If you Google the first number beside or just below the Bosch trade mark you can find them. They are even sold on eBay!

The Infineon chip is a microprocessor. It will hold some embedded software, so replacing it is not an option. Physically, it is a BGA mounted chip, which means it has solder points underneath it. Unless you own the right equipment, it will be very difficult to solder. I'd say replacing it is a show-stopper.

I am not quite sure on the NEC chip. I *think* is is also a microprocessor of some type, but I could not find the datasheet on it. I found so for sale, but no datasheet, which rings alarm bells.

EDIT: The one with the bar code and date on it - that's a special. Manufacturers do this to prevent copying.