[SOLVED] Read only SD card - sorry

[HBomb3]

I am trying to add lcd_rotate=2 to my config.txt.

The boot SD card mounts in OSX 10.13.6, but it is read only. When I use the Terminal to "sudo nano /boot/config.txt" it asks me for a password;

Have you got that path correct? Try "sudo nano /Volumes/boot/config.txt" if you're on your mac. I don't think you need sudo as well.

Just tried "sudo nano /Volumes/boot/config.txt". Same thing. It asks for a password.

I just tried erasing the card in OSX and it fails formatting to anything. Wonder if the card is bad? I've only just read that this is a thing.