ROM for the new MK809IV Quadcore??

[LolekUK]

I have MK809IV RTL8723BS and try:

- ugoos_MK809IV_version_4.4.2_1080p-20140430: don't start
- ncr_31_mk809III_kitkat (neomod) with kernel_KK_4.2.5_RTL8723BS work but wifi signal is instable

the only working rom is: MK809III,UH007B_8723bs_4.4_1080_20140924
WIFI signal is good
1080p working
problem for this rom are:
max cpu speed 1.4 and not 1.6
the key warms

I have just received my mk809iv, but have problems with setting up VPN connection, none of the VPN apps, pptp or l2pt works. Can I use any of the ROMs mentioned above or shall I check some more details about my device? At the moment I know its mk809iv :/

Thank you

Karol