Weekly ROM install mistake


May 28, 2021
Hi guys I messed up and accidently installed an older ROM on my Mi 11 Ultra (21.8.11 to 21.8.4) and now it's saying I have no OS and can only boot into twrp. I've been told to just install the latest ROM but I'm struggling to copy over the download from my PC to the phone. My PC makes a connection sound and the phone shows in mi unlock tool but I cannot see my Phone to copy the ROM. Can anyone advise please? Many Thanks