Test plan (i5-7200U):

• echo 1 | sudo tee -a /sys/devices/system/cpu/microcode/reload
• reboot
• cat /proc/cpuinfo | grep microcode | head -n 1

The microcode update isn't actually applying for me, despite being on the list of affected chips. I've tried a few times. The microcode update appears in dmesg, but it's just reporting updating from 0xCA to 0xCA.

Works for me when manually reloading with echo 1 | sudo tee -a /sys/devices/system/cpu/microcode/reload (this requires no reboot):

[ 1144.388399] microcode: updated to revision 0xde, date = 2020-05-18
[ 1144.388592] microcode: Reload completed, microcode revision: 0xde

The microcode isn't loaded automatically on boot, though.