Hey never mind, just came back to delete my post. I just flashed the card and booted it up. Running smoothly now, better than I could imagine. Thank you for offering help.

Hey there.
So I bought a used recalbox, built on a raspberry pi 2. I wanted to put in my WiFi-SSID but didnt have a keyboard. Then I discovered that Version 4.1 has an onscreen-keyboard!
So instead of changing the old SSID on the recalbox I changed the SSID on my router and it worked, I got online. Only to find out that for some reason the recalbox wont update to 4.1. Great. Now how do I install the Version 4.1 without USB-mouse or USB-keyboard? is that even possible? Grateful for any help...