Here is latest update for the Vido Yuandao (Window) M8. Our custom firmware is based on firmware official release dated 2013/10/09.

( M8-4.2-20131009-ZZ-固件+刷机工具+刷机教程+驱动.rar  - M8-4.2-20131009-ZZ.img )

Build information:

Kernel: Linux version 3.0.36+ (root@ubuntu) (gcc version 4.6.x-google 20120106 (prerelease) (GCC) ) #719 SMP PREEMPT Wed Oct 9 16:59:55 CST 2013

Android 4.2.2 Jelly Bean: LIRUI/rk30sdk/rk30sdk:4.2.2/JDQ39/eng.root.20130930.093342:eng/opinions-on-teclast-p90hdst-keys

ro.rksdk.version=RK31_ANDROID4.2.2-SDK-v1.04.00

Notes: 

- any update received thru OTA may interfere with our custom firmware, we recommend to refuse any OTA update

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 storage space for applications (/data partition) to 4 GB
• kernel modules (cifs, tun, lan, serial, xpad) compiled by Oma & Crew RKTablets, thank guys!
• NEW! : optional ClockworkMod (CWM) Recovery easy install package

Download: 

kasty-yuandao_vido-m8-422-20131009-rooted4.zip

Flash the firmware 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 Vido Yuandao M8 tablet to test the custom firmware.