Here is an Android 4.2.2 Jelly Bean rooted firmware for the MINIX NEO X7mini quad-core MiniPC based on latest Minix version 010a from 2014/02/11. 

(NEO_X7mini_20140211.rar / X7mini_20140211_OTA.img)

Build information:

Kernel: Linux version 3.0.36+ (root@zhangboyu-desktop) (gcc version 4.6.x-google 20120106 (prerelease) (GCC) ) #35 SMP PREEMPT Tue Feb 11 16:11:09 CST 2014

Android 4.2.2 JB: rk31sdk/rk31sdk/rk31sdk:4.2.2/JDQ39/eng.root.20140122.105724:eng/opinions-on-teclast-p90hdst-keys

ro.rksdk.version=RK30_ANDROID4.2.2-SDK-v1.00.00

Official firmware revision history:

Release Date: 2014-02-17

Change log:

1.) Improved video sync. performance;

2.) Increased DDR frequency, improving overall performance;

3.) Updated default video player;

4.) Preloaded official XBMC MINIX Edition (Version 12.4 MINIX);

5.) Preloaded latest AirPin(PRO), AirDroid, CloudTV app.;

6.) Improved web camera support;

7.) Preloaded Skype app.;

8.) Battery status adjusted from 0% to 100%;

9.) Enhanced HDMI signal strength;

10.) Enabled OTA update protocol for future updates;

 

Custom firmware features:

• root with latest SuperSU version 1.93 (free version)
• removed most Chinese and unnecessary applications
• Google Play Store fixes so more application are visible/compatible
• updated busybox v1.21.0.git (2012-11-29)
• Unix like init.d boot scripts support, more details on init.d scripts here
• changed permissions on external sdcard to allow write access
• increased storage space for applications (/data partition) to 4 GB
• disabled OTA updates (may cause problems with our custom firmware)
• kernel modules (cifs, tun, lan, serial, xpad) compiled by Oma & Crew RKTablets, thank guys!
• NEW!  optional ClockworkMod (CWM) Recovery easy install package

Download: kasty-minix_neo_x7_mini-422-20140211_010a-rooted4b.zip

Please flash with Rockchip Batch Tool 1.7, use Restore button.

Please report any problem with this firmware, I can't verify this custom firmware works as I don't have a Minix Neo X7 mini device to test the custom firmware.