My HiMedia Q5II Android TV box comes with firmware v1.0.2 (released in early September 2013). Subsequent to that, they have released firmware v1.0.3 in October 2013 and v1.0.4 in December 2013. Both of them were found buggy with numerous complaints from users.
In January 2014, HiMedia has worked together with Mango TV (芒果 TV) to come out with Mango Hi Q (芒果嗨Q) firmware v1.0.5 which is pretty good.
You can download the Mango Hi Q firmware for HiMedia Q-series dual core Android TV boxes here.
Make sure you download the firmware that matches with the model number of your HiMedia Q-series dual core Android TV box. If the label on your box has the wording of "eMMC" (which is the newer version sold to the market since November 2013 onwards), download the firmware for EMMC version. Otherwise, download the firmware for non-EMMC version.
The firmware upgrade file for my non-EMMC HiMedia Q5II Android TV box is update_dualcore_Q5.zip. I put it in a USB drive, plug the USB drive into one of the USB port of the TV box, and tried to flash it into the box by using a pin to press its "reset" button and boot up the box. The upgrade failed. Apparently this is due to the firmware that pre-installed in my box is English version instead of Chinese version.
I then renamed the file in my USB drive to become update_dualcore_Q5_en.zip, and tried again. This time, the upgrade is successful, and I got Mango Hi Q v1.0.5 in my box.
The default language of Mango H Q user interface is Chinese. You can set it to English by going to Settings (the right most tab at the bottom of above screen), look for Language and Input Method (the icon is a square box with an "A" at the center), change the Language ("语言") to English.
After you installed Mango Hi Q firmware, you will notice the following are missing:
- Google Play Store
- Web browser
After that, you can remove the Jailbreak APK.
You can also restore back the built-in web browser through the pre-installed WiFi Analyzer app. Just go to Online Help in WiFi Analyzer once, and the web browser will be back.
As for the missing HiStore and Google Play Store, I use 7PO Market (奇珀市场) as alternative.