Just to clarify thing a bit:
- MapThis! does not read/write to flash memory (you can take my word or examine the source code, which comes with any major version release), so it cannot brick PSP.
- in theory, due to it's high memory consumption, it may interfere with the work of some FW plugins. This is why users are encouraged to disable plugins while using it...
-I would start by checking if your memory stick is corrupted (You may a card reader for this) and recovering the data..
-if you still have access to recovery menu - try to disable all plugins that you have (chances are they are the ones causing problems)
BTW, mapthis! always defaults to 333Mhz on startup...
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