BTW, modules work for TDS3K, DPO2K, DPO3K (not for BW upgrades, but keygen available) and DPO4K.
For MDO's, there's a keygen (in this forum, didn't search...) for the MDO3K, and some work has been done for MDO4K's as well, but you'd have to check the related thread (don't remember if it's just the key that changes, or if the algo is slightly different...).