[Q] RK2818 Rockchip help - Android Q&A, Help & Troubleshooting

OK, hi guys,I'm a bit of an Android freak and I recently acquired a cheap RK2818 rockchip tablet and am trying to get it on this rom
http://http://forum.xda-developers.com/showthread.php?t=1038819
You can see the Tablet here http://www.cnmlifestyle.com/ (it's the cnm Touchpad II)
And here are the specs:
Technical Specifications
CPU ARM11 600MHz
Display 7 inch Touch Screen with 16:9 aspect ratio 800x480 WVGA resolution
Operating System Android 2.1
System Memory DDR2 256MB
Storage 4GB Solid State
Wireless Access WiFi 802.11b/g
Orientation Support G-Sensor
Additional Controller Built in Trackball
Music Decoder MP3 / WMA / APE / FLAC / AAC / OGG / AC3 / WAV
Video Decoder Max.1280*720 MKV, (H.264 HP) / AVI / RM / RMVB / FLV / WMV9 / MP4
Memory Expansion Micro SD Card (Trans Flash) up to 16GB
Battery 4000 mAH Li-Polymer Rechargeable
Product Dimensions W x 19cm, H x 11.5cm, D x 1.5cm
Now the problem I have is when I follow this guide http://www.androidtablets.net/forum/rockchip-based/439-how-unpack-repack-custom-firmwares-rockchip-rk28xx.html
and use the AFPtool to try and unpack the update.img and swap in the filed needed, it gives me this output,
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
So it seems unable to unpack the system.img and the boot.img so i can't repack it into a cm7 rom to flash, any help would be much appreciated and I'm not expecting any miracles Thanks.

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Ok, would really like some help with this if anyone can, I've also tried using afptool on the root of my c drive and still no luck, gives the same read out as before and as a long shot I tried unyaffs but obviously that didn't work either.
Thanks in advance
Sent from my mimmi using the beautiful Flame GDX ICS rom
Edit: Found a premade rom which works perfectly on my tab, help no longer needed, thanks