How To Fix Logitech K400r Keyboard (Keys not responding) - YouTube
How to connect a Logitech K400r keyboard to a Windows 10 computer - Quora
User manual Logitech K400 (English - 2 pages)
I'm sick of old stuff you can't but anymore on this sub! I bought this Logitech k400r about 10 years ago and no matter how much I abuse and/or neglect it, it
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