New Atmega32U on Arduino due doesn't work

Using Arduino IDE 1.x
1

Hi,
I just have a new Arduino due board and I swaped the on board Atmega32U Chip with a brand new on out of curiosity. However, the programming doesn't work anymore.
Should I bootload the new Atmega32U before programming? In the datasheet It seems like to have a bootloader pre-installed. So I'm getting a bit confused.
Can anyone have some guess?
Lang

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(deleted)

3

AFAICT, there is a 16U2 on a DUE board aside the Sam3x....

4

What is the "correct firmware"? Does Arduino provide it?

spycatcher2k:
You need to program the 32u with the correct firmware.

5

Hi,

look for IDE GitHub - MCUdude/MightyCore: Arduino hardware package for ATmega1284, ATmega644, ATmega324, ATmega324PB, ATmega164, ATmega32, ATmega16 and ATmega8535

Best regards.