I managed to goof up. I tried following the same lines of the hack in this thread, but managed to get myself in a bad situation.
I was trying as a first step to gain SSH access to my MSO5000 scope, which I did by modding the start.sh file. I appended the following code to the end of the file:
/usr/sbin/sshd
/etc/init.d/550sshd restart
However, now after applying the patched firmware to the scope, it correctly goes into the boot loading showing the RIGOL logo, however, when the progress bar reaches the end it stalls - I assume because either of the commands I added are not valid.
I've tried holding down the SINGLE button while booting, but I do not seem to get into the secret menu to be able to re-patch the firmware.
Also, even with the network cable plugged in, the network does not seem to initialise and the Rigol scope does not get assigned an IP, so SSH does not seem like an option to recover as well.
Do you guys have any ideas on how to recover from this?