Yes, I'm at Lectores Electrónicos with same nick, but lately not participating much there.
Now we've decided to abandon Amazon because Big Brother stuff (lately, each time we read a book not purchased in Amazon, we receive spam like "once you've read blahblah perhaps you would like read blah blah"). We've just sold our Kindles and purchased Tagus because are cheaper than i62HD and we know are the same device.
In relation to firmware I cannot found any difference between them. All of them lights equal. Only changes seems icon battery. No photos because they are equal.
I would like to know how works the light regulation program in order to modify it or create a new one as standalone app. (Last option will be open device and do some soldering).