I agree with your Mother - i hate the new dark colors and font of the guide. I find it harder to read and makes the whole screen darker so harder to watch TV through the guide while searching. also has anyone else noticed that all TV now seems darker - i am trying to find my TV remote so i can brighten up the screen.
Only good thing i have noticed is that programs taped from standard def (stations like metv and channel 806) are faster when doing the 30 second skips.
I wish they would give us the option to go back to old guide style.
There has never been a choice to go back to earlier firmware. I even specifically asked them a couple of years ago when after one of the updates it started to give me HDCP 2.2 error. Anyway, it is always an irreversible process(In fairness to Telus, it is to be expected as otherwise it will be much harder for their Tech support CSRs to keep tab on multiple versions of the software)