Windows 10: 21H1 broke my keyboard. How do I get back to previous version 20H2

HiLast june I updated one of my older computers to 21H1After that upgrade some keys s,d,k,q,w,alt and other keys in the keyboard randomly stop working.Stopping happens in long periods from minutes to long hours or the full session. Sometimes everything worksSometimes some keys stop workingSometimes stopped keys change for a whileAfter fresh reboot sometimes keys work or notI was reinstalling HID drivers for keyboard and, just in case, also touch pad drivers. Some post say synaptics touchpadsIt repairs during a short time, but the problem comes again.I also reinstalled the system.My self and

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Should I update to 20H2 or wait for 21H1?

I just bought a Fujitsu Q704 convertible and it is running windows 10 pro 1909. It has the 20H2 version listed in available updates, and I am wondering if I should allow it to do so, or wait for the 21H1 version? It has a i3 processo r and 4gb of ram. It seems to run 1909 just fine and only issue in the reliability monitor was from when I couldn't figure out why the pointer was missing when I put the tablet back into the keyboard dock and forced windows to shut off with the tower button, until I realized I did not fully insert the tablet into the keyboard dock, otherwise no noted issues.

Thanks

 

KB5001330 Windows 10 Insider Beta 19043.928 21H1 and RP 19042.928 20H2 Insider

Perhaps try the only thing that worked for me (posted on the previous page). I had gone through every other option being suggested here:
KB5001330 Windows 10 Insider Beta 19043.928 21H1 and RP 19042.928 20H2

 

Keyboard input lag (Logitech K270 wireless keyboard, Windows 10 20H2)

Hi there. I've got yet another Windows 10 problem. lol

This time it's my keyboard. I'm using a Logitech K270 wireless keyboard, on Windows 10 Pro 20H2. I have been experiencing keyboard input lag off and on for a couple months now, and I've searched for possible solutions, but none so far have worked. I was hoping you guys could suggest some fixes.

Here's what I've tried, based on the suggestions I've found on the web:

• Updating the keyboard/dongle's drivers (there are no drivers on Logitechs's site, oddly) and firmware. Nope.
• Swapping USB ports. Nada.
• Unplugging any extraneous USB devices. Zilch.
• Checking the batteries. No joy.

As I was typing this it was lagging here and there. It's a bit disconcerting. Anyway... I don't think I missed anything, but if you need more information or diagnostics, lemme know and I'll upload 'em.