LOL! im so damn slack on my answers, here I go:
un-pbo the somalia.pbo from your addons folder
un-pbo data.pbo its in your DTA folder in the flashpoint root dir.. (yeah, lol big extract, sorry, dunno any better way)
Open wrpedit, and open up the island
It will say something about flags, but nevermind that
click on the surfaces tab click add...
find the texture filename in DTA\Data folder called Heli_h
Select the whole island from top left to bottom right, the dotted line will appear, click Change in the surface tab..
save it, quit, in your addons folder there is the folder Somalia
use a PBO maker/packer and compress the whole folder into Somalia.pbo, replace the older one.
Your done, open OPFlash, and enjoy