Due to current issues with Logitech Bluetooth devices, I need to update the /lib/udev/rules.d/70-hid2hci.rules
file.
A few weeks ago, an update overwrote this file (with an attempted fix that didn't, for many, work), and it took a while for me to realise why my mouse and keyboard stopped working again.
I have memories of being able to store an overriding rules file to a usr directory that will be checked before the lib file, but can't remember the specifics.
Could someone please jog my memory.