I figured this out. FYI the I just had to use the X2 config file provided by Artillery which has a different connection string in [mcu] vs. what ModBot used in his. X2 Config Source here:
My process was as follows;
build linuxmint install per ModBot’s excellent tutorial.
Put X2 config found in the Artillery link above in ‘printer.cfg’ and upload to klipper web GUI.
Run “make menuconfig” and select the STM32F401 with “No bootloader” and USB (on PA11/PA12) and not enable extra low-level configuration options.
run “make”
boot your X2 printer with jumper between 3.3V and Boot0 pins.
run “lsusb” and verify ‘us 002 Device 014: ID 0483:df11 STMicroelectronics STM Device in DFU Mode’ is present.
run “make flash FLASH_DEVICE=0483:df11”. Ignore the dfu-util: can’t detach error, it is a non-factor.
Go back to web gui, tell Klipper to Restart, see successful connection.
drink a beer.