How to early-update microcode without sudo/apt

[Winebox0hana]

Question text

On Debian, when machine is boots, it shows error:

[Firmware Bug]: TSC_DEADLINE disabled due to Errata; please update microcode to ....

There was not sudo/apt founded. And I'd like to know the way to early update.

How to make it??

I appreciate you.

[Firefishy]

Does with apply to pcengines APU hardware? I am not seeing it.

You sure install amd64-microcode package. If Debian, then there is a guide here: https://wiki.debian.org/Microcode

[silentcreek]

I don't see this either on Debian 11 (and neither did I on Debian 10). I do have the amd64-microcode package installed, though.