Thank You!! :D
If I remember well, The PSP version of Worms Open Warfare 2 have the same kind of terrain like Battle Island and A Space Oddity.
Try to use this tool called "UMD Gen", it will help you open your WOW2 PSP Rom/Iso: https://www.romhacking.net/utilities/1218/ (https://www.romhacking.net/utilities/1218/)
How to use this file?
1. Download wkTerrainSync from this link (https://www.tus-wa.com/forums/wormkit-modules/wkterrainsync-v-1-2-2-released-play-custom-missions-online-33098/?action=dlattach;attach=196130)
2. Enable loading of wormkit modules:
Game settings => Advanced => Load wormkit modules
3. Restart your game after step 2
4. Download terrain files and put them into WA Folder\DATA\Level