Broke my MCU Octopus v1.1 and am trying to get the replacement operating

I did some bad wiring and shorted out the fan ports on my MCU Octopus 1.1 running my Vcore3.1. So I installed a new Octopus 1.1, All cables were disconnected, old MCU removed, all jumpers set to original MCU's settings, new MCU mounted, and then all cables but the fans are hooked up. I power on just the rPi and eventually see "mcu 'mcu': Unable to connect on the klipper touchscreen and on the klipper web page. The final line is "Error configuring printer". This makes sense as the MCU is not powered on. I power on the MCU. Wait a while. Click "Restart" and get: "Klipper reports: ERROR" and "mcu 'mcu': Unable to connect" ... "Error configuring printer" If I click Restart I breifly see the following: This is followed by blue screen reporting: "Klipper reports: STARTUP" and "Please retry in a few minutes" until the screen returns to "Klipper reports: ERROR". Inside the KLIPPER LOG I see this as the last few lines: Extruder max_extrude_ratio=0.266081 mcu 'mcu': Starting serial connect mcu 'mcu': Unable to open serial port: [Errno 2] could not open port /dev/btt-octopus-11: [Errno 2] No such file or directory: '/dev/btt-octopus-11' webhooks client 3040103800: New connection webhooks client 3040103800: Client info {'program': 'Moonraker', 'version': 'v0.8.0-39-g6c7dfe5'} I appears that the rPi and MCU/OctopusV1.1 are not talking. I did remove the jumper from the power jumpers to match the original MCU so it is getting power from the 24V source instead of a USB C. I am using the same USB C to USB C cable to connect them togather. I have made no changes to the rPi. I expect that I need to do an initial firmware update to get the MCU out of its factory "as shipped" state. I expect that I need to get USB connecting between the rPi and MMU to go any further. What is the next step in configuring the rPi and MCU to get them communicating?