Here is genuine 02.02.SP2
This share was shared in Rigol official chinese sites, March 2010.
After then they take FW update off.
(Rigol sides in China, NOT any "rigolna". This "rigolna" do not update they sites or they update very very slowly.)
http://www.box.net/shared/et7ztaxaufThis is whole zip include upgrade manual and FW upgrade for DS1000E and DS1000D (be careful: use right model!!!)
I do not know if all product versions are compatible for old FW.
Also I do not have new official product version 00.02.04.00.01 FW. (exept inside some Rigol scopes)
This time nobody can not know difference, we can only quessing.
Remember this manufacturer note as long as it is in current note.
"6. Before the upgrade, please contact RIGOL Technical and Support Department to confirm whether the current firmware version can be upgraded to the target version or not."
If it works with one or some units it do not proof that it works with you individual scope.
So you know risks for FW upgrade/downgrade and mod.
Think twice before you do and think more than twice if you really need it.
Maybe littlebit more sampling noise as original DS1102E. (I have seen one, there was more sampling noise/jitter... sampling noise is one of most important think in digital scope quality... peoples can simple think that A/D sampling is just as "modulator" (sampled signal is modulated with this "noise" and you see on the screen only this production, not original signal.)
(factory have not selected this individual unit (main board) for make 1102E ... it have ranked to 1052E production)
And most important what Rigol need is better quality BW filtering before A/D... NOT simple more wide. It need more tight reject for high frequencies! Also it need less noise in A/D timing. Good mods for these?
becouse factory have not select this individual HW for 1102E)
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BTW this DS6000 is very interesting scope....(pict 1)
http://www.rigol.com/index.aspx?type=zhcn(here you find also manuals and other downloads what are more frequently updated as in "rigolna"... may be "rigolna" is in US and this is maybe reason why they are not updated. )