yeah, I bricked mine too trying to do that
the official themes aren't so bad once you get used to, and there are very good ones here http://www.psp-themes.net/ (there is one from gears of war)
for flashing, I recomend you to use a plugin called CXMB http://dl.qj.net/CXMB-v2.4-PSP-Homeb...4539/catid/151, this plugin, uses files stored on your MS instead of the ones on flash0 (they go on ms0:/cxmb/)
so far, the only thing I've been able to change succesfully are the gameboot.pmf files, but is ok.
if you change anything else it locks and you have to disable the plugin removing the MS
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