Heya,
I think you’re almost there. When I look at your printer.cfg, you have:
[mcu]
# To obtain serial ID, SSH into printer and command: "ls -l /dev/serial/by-id/"
serial: usb-Klipper_stm32g0b1xx_4200190017504D4D36343020-if00
restart_method: command
You didn’t quite get the serial path correct, you need to tell Klipper where to find the device. Could you change the above to:
[mcu]
# To obtain serial ID, SSH into printer and command: "ls -l /dev/serial/by-id/"
serial: /dev/serial/by-id/usb-Klipper_stm32g0b1xx_4200190017504D4D36343020-if00
restart_method: command
As a hint for next time, use DFU for programming the MCU on the Manta card - with that there is no need to copy the firmware.bin file onto a PC and format an SD Card. Everything is done on the Manta and it is much faster and much less error prone.
Just looking over the Manta E3EZ User Manual and the instructions for using DFU are terrible but you can find much better instructions elsewhere.
Let us know how you make out.