Saving out 2k PVR files in 4bpp format

We are trying to save out 2048x2048 images in PVR format since the iPhone 3GS and iPad can support that size. Is there a way to get the 4bpp option to save out the 2K images? I keep getting this error.

"Could not save as “C:…test.pvr” because there is not enough memory (RAM).

Is this a memory limitation of the 32 bit plugin?

2kx2k textures should be supported in the latest version of PVRTexTool. Which version are you using and which form i.e. Photoshop plug-in, GUI etc?

the latest version is available for download here: