Need help for flashing ZERO Devices Z4C Quattro (RK3188) - choppy video

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Dear All,
i got this device recently :

ZERO Devices Z4C Quattro Mini Android PC Quad Core - RockChip SOC Powered

• Android 4.2 - RK3188 Cortex-A9 Quad Core CPU
• Mali-400 Quad Core Graphic Processor Unit
• 2GB DDR3 - 8GB Nand Flash
• Wireless 802.11b/g/n - Bluetooth 4.0 (Broadcom solution)
• 1 x USB 2.0 + 2 x Mini USB Ports
• HDMI Port - Micro SD bay (up to 32Gb)
• Supports external HDD
• 8 x 3 x 1.4cm

http://www.zero-devices.com/products.php

Works great and is very fast but video play is very choppy to an extent it is almost useless.
i have tried the latest version of the stock rom uploaded on www.zero-devices.com but it's still not good.

Any advice on flashing it with a custom rom which may improve the video quality?

Thanks,
Stefan

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This is how the PCB looks like (if it helps identifying the correct rom )



and it has the following chips

Rockchip (CPU)
RK3188-T
SBAU32PX 1345

FORESEE ( this should be the 8gb flash)
NCTSTS76-08G
01V1305091737
1319

iTE (hdmi chip)
IT66121FN
1339-BXG
ECA0NB

AP6210 ( i guess wifi chip)
C0DB123
1347

4x ( 2GB RAM)
GEIL
CG1L512M88BA12LH
512X8DDR3 HL
1342

under the sticker there is written:
MK908 V5.0
2013.09.18
Netxeon


PS: Seems that i have broken it somehow while removing the heatsink and it doesn't want to start any more, shame it was a nice stick