Update: PSP RCO Editor v1.15c is now up, and fixes another bug in GIM conversion routine.
ZiNgA BuRgA has updated his PSP XMB customization program, which allows users to replace icons, sounds, text data, and page data found in RCO files on the PSP's flash memory.
Download: PSP RCO Editor v1.15b
Changes in v1.15/v1.15b:
<li>Fixed a bug in the decompression and GIM conversion routine
<li>Rewrote GIM BMP conversion routine
<li>Dimension restrictions removed, as well as the "visible dimension" nonsense (RCO Editor automatically fixes that)
<li>osk_utility.rco icons no longer cause crashes
<li>Support for creating 4 bit and 32 bit GIMs (previously, only 8 bit supported) - effectively removing the 256 colour restriction
<li>You can now use ICO, PNG and GIF files as inputs, in addition to 4 bit BMPs
<li>Other minor changes and bug fixes
<li>Added option to disable compressing resources - this is for some 3.7x RCOs not working properly with compression enabled
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