I think it's quite important the order of doing things when Manual Key Updating so I thought it might be useful to others if I documented the basics n order that worked for me on my 600 n Cli image. I used WinSCP to ftp n edit files as the text editor is linux friendly.
1. Turn off EMU
2. Edit Key file DELETE ALL KEYS
3. Edit Config to Auto Update
4. Reboot
5. Turn on EMU on Sly 1 allow time for auto update
6. Turn off EMU
7. Edit Config to NOT Auto Update
8. Edit Key file to correct key
9. Reboot
10. Turn on EMU
Worked for me, hope it helps anyone struggling
1. Turn off EMU
2. Edit Key file DELETE ALL KEYS
3. Edit Config to Auto Update
4. Reboot
5. Turn on EMU on Sly 1 allow time for auto update
6. Turn off EMU
7. Edit Config to NOT Auto Update
8. Edit Key file to correct key
9. Reboot
10. Turn on EMU
Worked for me, hope it helps anyone struggling