Error 0x8027025a on Xbox Dashboard startup

So, my little brother’s Xbox is reporting Error 0x8027025a when he tries to boot it up. A quick search suggests this is an issue with Xbox services or possible a corrupt cache? So far he’s tried the usual. Turning it off and on, leaving it unplugged for 30 seconds, a soft reset, and checking Xbox service status, which is showing up as green across the board.

Obviously since it’s not able to boot up the dashboard, he can’t get into any of the setting menus, which makes any sorts of software wipes impossible, as far as I’m aware

So, what is my next best route? At this point I think it’s looking like a new hard drive, maybe something got corrupted on there? I don’t actually live with the rest of my family, I’m going around tomorrow to have a look. Hopefully you guys can give me some pointers! I’ve never worked on an Xbox One before but got plenty of experience with phones. Where should I start?