Assuming you also mean using a set of plugin control files in flash as well to remove the PSP's dependency on a memory stick to have a custom theme on boot (as I can't think of another reason to do this)... I doubt anybody's tried, because it's a bad idea to begin with.

If you screw up anything with CXMB and the PSP refuses to boot full with it enabled (and I've run across at least two "working" themes that have done that to me personally), normally disabling it is as easy as removing the memory stick and restarting the PSP, where it'll be unable to load the plugin on startup and will boot the normal/unmodded VSH where you're free to change things (and you can just mod the data on the stick anyways).

If all of it's installed in flash3, you can't do that. While you may be able to still enter the recovery menu before the problem takes effect, I really don't feel like risking needing to pandora my 2000 to run a check (seeing as with the 6.20 permanent patch the recovery menu check appears to be after the IPL)... because even though with the perma patch you can boot into OFW mode, in OFW mode you have no way to disable the plugin anyways since you will lack access to the recovery menu to toggle it normally, and last I checked signed homebrew does not have the permissions to write to flash for you to edit the files.

Again, this is assuming you want the whole package to be in flash, if not ignore this.

 

If the control files would still be on the memory card then it shouldn't be an issue (as flash3 itself is not critical last I checked, only being used for some scratch data), did you just want this so it'd load faster or something?

I've never used xmb hider so I can't comment there.

 

however i have had a quite a few running like this on my phat (when i till used it)

thanks, im a try it
that was my main concern "was it critical" just had some trouble forming that to words

 

a phat is a 1000 and the IPL (or inital program loader) is what boots up the PSP

thanks again both are working (but my allpaper issue still stands)

startup is now almost instaintious