You mean unlocking extra features?
It doesn't work on the MSOs.
Really??? I've been discussing it in the other thread and nobody told me that!
Oh, I thought you meant using the same methods as the DSOs.
It
is possible to hack it but it's much more involved than just entering a code generated online using your serial number. You need to open up your 'scope and use a JTAG device to dump the contents of the flash memory for the keygen.
I see you're already reading the "Sniffing the Rigol's internal bus" thread where this being discussed. That's the place to be.