Arduino Nano Every SAMD11 Firmware

Hello, I could not find the Open-source Arduino firmware for SAMD11 which allows communication between the main MCU and the pc through UART and USB ports.
Can someone share the link of the source code of this firmware?
Thanks
Ege

Hi @egeozgul. Here it is:

There is some additional information on the subject here and in the linked topics:

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