A small word of caution to those thinking of upgrading to 3.01.
I had a very interesting discussion with a Canon Technician some years ago. He commented that it is only wise to upgrade firmware if you are suffering an issue or the manufacturer recommends such as a fix for a known problem. He advised (correctly) that upgrading firmware always carries a risk, either firmware corruption during upgrade or chipset incompatibility resulting in hidden complications. He believed automatic upgrade to later versions for no reason to be an ill advised risk. Bearing in mind the difficulty in downgrading 3.01 to lower versions it would be wise to consider exactly what 3.01 is offering you by way of improved performance. All too often people go for an upgrade without any manufacturer recommendation or known issues just because it is a higher version number....not the wisest of moves IMHO unless you know hoe the later versions behave on earlier hardware platforms and fixed software/firmware interlocutors.
I am still running 2.04 without having any problems with the scopes operation. Some versions of 2.05 have 'issues' others do not. Please also bear in mind that Rigol made it known to me that the newer versions of software beyond 2.04 contained certain housekeeping changes that did not effect or improve normal operation of the unit. The housekeeping is believed to be the attempts to prevent upgrading of 50 MHz scopes to 100 MHz.
I am not suggesting that people who upgrade to 3.01 are making a mistake, but before you do so, ask yourself what you are hoping to achieve and what if any 'issues' you are trying to resolve. The latest 3.01 FW DS1052E does not, as far as I am aware, have significant performance or functionality improvement over the earlier version. AFAIK my version 2.04 unit had the last documented hardware improvement in the form of an LED backlight instead of CCFL. A good move on Rigols part but consider in another (fictitious) situation where later firmware for an LED backlight behaved differently when applied to an older model CCFL dimmer circuit....you could have all manner backlight dimming issues. That did not occur with the DS1052E but it could so easily have been have been a hardware incompatibility that the firmware did not recognise upon installation.
Be careful out there
Fraser