Firmware Version: Android Jelly Bean 4.1.1
Release date: 18.03.2013
Build number: crane_pub-eng4.1.1
In today episode: the newest Android 4.1.1 firmware release for Justop Android TV Box V2.0_REV3_Beta, you can download the new firmware from here or from here.
The method is just a little bit different till now: burn the firmware with PhoenixCard Tool on your micro SD card, insert it in your MK802II stick, power on and wait about 15-20 minutes; in my case the blue light didn't came off, so I turned off the power after more or less 20 minutes, took out the micro SD card, and then powered on the device. Try to use quality fast SDHC card to update. The firmware is much larger than ICS.
This firmware version also does not have root acces, the wifi is pretty unstable on my unit, I had to try several time until I could connect to my WPA2 Wi-Fi Protected Access Network, but after that Play Store work with no issues at all. This is still a beta version, but it seems to bring a scent of stable version. Otherwise the system seems much smoother and faster than ever, and I guess I'll stick some more with this version.
Always keep in mind that this is not a review, just a first sight of this firmware. You have to test it more for another details, to see if it satisfies your needs.