USB mouse not working is a known issue for 5.x systems, use keyboard instead.
But external USB keyboard should work. Check BIOS and machine object property settings.
is there any known fix for this? or a kb I can reference to explain the problem?
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As I recall there was enhancement for USB pre-boot control and hand-over to OS in EEPC 5.2.3. Now we have 5.2.4 with 5.2.5 coming.
I would suggest to get 5.2.4 and test it with your hardware.