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The e-125 (like my em-500) is not upgradeable to PPC2002 or WM2003 for at least 2 reasons: 1. It uses a MIPS processor, not ARM. 2. The OS resides in a static ROM as opposed to newer devices FlashRom.
As for trying to get it to work with PPC2000, you might have had luck if you were using an ARM based device.
I really liked my Casio PPC, but it was hard to find programs that also came in a MIPS version.
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