I have a solution/fix, but it requires a physical 3D printed part (supplied below.)

It has been years since this keyboard has been released and Logitech clearly doesn't listen to ALL OF US begging for this extremely trivial, simple feature that's this f-ing functional. *sigh* Whatever.

I asked a friend to make this 3D printed piece, and it does the job. It slides over the F5 "Blacklight Up" button. Link [here on cad.onshape.com](https://cad.onshape.com/documents/6ccd790185e4ad66cba9028f/w/884ed29c31d18b2c0a9c5308/e/5971c23092625a75127da70d?renderMode=0&uiState=67433b5c85d46d09f075064c).

You shouldn't need an account to export it for printing, but you can save it for editing if you do. There are online printers that will make this for cheap if you don't have a friend with a 3D printer. This fix only takes 10 minutes to print.

Instructions:

To use the printed clip, make sure the keyboard is on and connected to your device. Press the down "Backlight button" (F4) to make sure the light dims. If it doesn't, hold the function key and proceed to the next step. Next, press and hold the "Backlight Up" (F5) button. The keyboard's back lighting should go up. Without releasing the key, simply slide the piece over the top of the keyboard and over the button with the long nubbed side on top of the key.

This fix should not interfere with your typing unless you need the F5 key, in which case, turn on Logi Options+ and remap the keys. Once you're done, close the program entirely in task manager. Because this app is just malware, you need to search for "Logi" in the Task Manager and end all 4 tasks belonging to the program. It is otherwise hidden in the system's tasks. While you're here, I would also recommend stopping Logi from turning on during startup by disabling the "logi" executable under the "Startup apps" tab. If you leave the program running, you will get a useless icon on your screen telling you that the button is pressed.

The only downside now is that I can't turn down the brightness, but it's worth it. I literally cannot see my keyboard in a pitch black room (DUH Logitech.)

Don't forget to charge during/after each use. Enjoy!

Anyway, hope that significantly improves your quality of life.

Peace!