When I tried to save the bluetooth.conf file, nano reported
"Error writing /etc/modprobe.d/bluetooth.conf: Read-only file system"

I tried using chmod to give the file write perms, and it gave me the same Read-only file system error.

Am I doing something wrong? I am using the latest version of PuTTY, and using Recalbox 7.1.1 Reloaded installed with NOOBS on a Raspberry Pi 4 B+.