I'm using HP Probook 440 G4 for last 3 months. And I couldn't increase/decrease brightness using Fn+F5/F6. Every time I tried, it said something like this.
[Window name] HP Hotkey UWP Service
Error: HP Software Framework is not installed in the system
Please download and install from the link -
ftp://
Note: Restart system after installation
The link suggested here is not valid anymore. What can I do?
22 Answers
Actually that link is valid but you have to call it with the http protocol like so: . This installs the HP Software Framework and the HP CASL Framework Service, which, when running, enables hotkey support.
So, I tried something from the internet. And finally solved the problem and that is how.
If you've not installed HP Support Assistant yet, please install it from their website and restart it.
It should be solved. But if not (that's my case), then go to windows searchbar and type Services. Go there, find HP Hotkey UWP Service, right click, stop it first and start it again. And Fn is working fine in my laptop.
There may be another solution like - Hotkey driver update etc. So, it may help.
