Hi all, I'm Luca, this is my first post but I follow Dave since years, I'm an electronic engineering student. I came over this thread while trying to update my DG1022U (illegally sold in EU, only after contacting Rigol cust.supp. I've found out this, since U version is not CE marked, worth the 259€ i've paid it, no differences with the EU DG1022A, except the mark), talking with EU and CN support this is how I solved issues with LabView not working drivers (my old fw revision did not support std IEEE488.2, undocumented in official latest prg manual, *RST and *TRG commands).

This is written by me, joining all the infos I had from cust. support and my successfully upgrading my DG1022U from 00.03.00.11.00.01.03 to the latest firmware 03.03.00.11.00.03.00 sent to myself by Rigol cust support.

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The following drivers, attached to this post, are compatible with all DG1022 DG1022A and DG1022U version, upgrading the instrument will not lose every data saved in the instrument.
 
0) Download all the required files, attached to this post
1) Turn off instrument
2) Disconnect the USB cable used for PC connection from the back USB B slave port
3) Pressing continuosly HELP button, turn on the instrument
4) Boot will be stopped, the only MOD button will turn on and wait
5) Insert USB Stick where previously you have been saved on the root the "DG10x2Update.GEL" file unzipped from "DG1022X(DSP)Update(Bootloader).rar" 
6) Wait until all led will stop blinking (around a minute)
7) Turn off instrument
8) Repeat 3-5 with the GEL file from "DG1022X(DSP)Update(Normal).rar"
9) Wait until all led will stop blinking (around 3 minutes, will start blinking up to the ARB button)
10) Turn off instrument
11) Turn on instrument and in Utility>Test>Info check 03.03.00.01.00.03.00 version is correctly installed.
 
WARNING: 
Be carefull to check Version note to verify that the upgrade is compliant with the instrument version.
An UPS is warmly raccomended while updating. 
Be carefull to not: disconnect usb stick and turn off the instrument while updating the firmware, an error in the bootloader update sequence will brick the instrument.
Dont accuse me after instrument malfunctioning after upgrading, updating failure or any other mistakes; take all this infos at your own risk. I was next to an heart attack while instrument didn't acted how rigol support told me it had to do.
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Sorry for my broken english, it's-a-me, another italian super mario.

Have fun, and enjoy the annoying blinking power button,
Luca, IU8BBM