I posted this below in my thread, but I think it might be useful here too:
I did the "Chatroom A" firmware check on my girlfriend's Pink Japanese NDS, and it revealed a bluish-grey screen which indicates Firmware 2. (I have to admit, I did find this odd because this Pink NDS is fairly new on the market here.)
After much trouble (see the thread if you care), I was able to run the latest 1.6 flashme file in order to permanently change the firmware. It starts up, and immediately gives a Warning Message that reads something like, "This firmware is not recognized. Continuing will possibly render your NDS inoperable. Proceed at your own risk."
After a week of losing hair on this upgrade, I decided to just go for it and roll the dice. So, we followed the flashme instructions as normal and shorted the metal bit in the back, waited till the counter reached 100%, held our breaths, and rebooted. Voila, worked fine! (Big smile and big, big sigh.) Over the next two days I tested and played and tested, everything is working just great.
I did not have any problems after ignoring the message and flashing anyway. THIS ISN'T TO SAY YOU SHOULD IGNORE THE MESSAGE, only that for MY case, it turned out okay.
Hope this is useful to someone.