X220- windows can't read machine type

[vinuneuro]

My X220 recently had the system board replaced at a local Lenovo Authorized Service Provider. They were only supposed to replace the fan but the speaker connector broke when they were removing the board. Windows now isn't able to read the machine type. System Update doesn't work because of this. CPU-Z and hwinfo64 show the machine type as qqqqCTO as if it were blank in the BIOS. Machine type is there correctly in the BIOS correctly, but they left the system board serial number blank. Could that be causing this?

[Neil]

Yes, it's the machine serial number that is needed in the BIOS for System Update to work. Take it back to the shop, they should have the necessary tools to fix this issue. They should have done it right the first time, but what repair shop would do that?

[vinuneuro]

Hi Neil, the machine serial number is there. So is the machine type. It's only the system board serial number that's missing. Would that be enough to do this?

[vinuneuro]

In case someone else runs into this problem: I fixed the issue by running the BIOS update utility and using the option to change model number. There's a note in it that says to delete what's there and leave it blank to restore it to the factory setting. This did the trick.