I have a Nexus 5 at home. For some reason I assumed it would have a MicroSD card slot, but it doesn't. So I'm trying to figure out what the sensible/easy way to load an OS on it would be, without bricking the device. I think postmarketos has a wiki page on the Nexus 5, so perhaps I just need to check what they do/did. I did boot an some test image (not Leste) over usb and verified that quite some kernel stuff works. I'll try it coming Wednesday.