Root phone without buttons?

Dear Fairphone users,

I have been using an FP3 for 5 years and although it still works I have been noticing lag after updating to A13. Problems that I have seen reported around the forum. I am used to custom roms that can boost performance of android devices and I did so with previous phones. However, I remember the need to use some physical buttons to navigate through some menu’s, or to go to bootloader menu (typically volume down and power buttons). My main problem is that these buttons stopped being functional some months ago. The only one working is Volume Up. This is not a problem when using the phone with apps like Wave Up.

My question is straightforward: can I access and navigate the bootloader somehow connecting the phone to a computer via USB and therefore avoid the use of the physical buttons?

Thank you very much for your help!

Cheers