Here is an Android 4.2.2 Jelly Bean rooted firmware for the Vido Yuandao Mini S tablet based on latest official update from Yuandao dated 2013/08/28. This firmware is designed for Mini S models having "ZZ" in their tablet case serial number.

(Mini S-4.2-20130828-ZZ-固件跟刷机工具.rar)

Build information:

Kernel: Linux version 3.0.36+ (wbj@tchip-super) (gcc version 4.6.x-google 20120106 (prerelease) (GCC) ) #422 SMP PREEMPT Thu Aug 29 11:15:55 CST 2013

Android 4.2.2 JB: rk31sdk-eng 4.2.2 JDQ39 eng.wbj.20130828.201302 test-keys

Custom firmware features:

• root with latest SuperSU version 1.65 (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 space for applications (/data partition) to 4 GB
• NEW! kernel modules (cifs, tun, lan, serial, xpad) compiled by Oma & Crew RKTablets, thank guys!

Download: kasty-yuandao_vido-mini_s_zz-422-20130828-rooted4.zip

Flash with Rockchip Batch Tool version 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 Yuandao Vido Mini S tablet to test the custom firmware.