This can be done from within Windows using a tool I found on edaboard but the only prerequisite is that the device is already recognized as a PL2303 USB to Serial converter. If you want to change it back, you need to rewrite this EEPROM. Any non-standard USB PID is written in there. After some searching around, it seems that the PL2303 can be connected to an EEPROM chip for some customisation (just like the FTDI converter chips). Inside the inf, replace all occurences of of PID_2303 with PID_0609 and use the Device Manager to assign the driver to the modem.For me, this worked in Windows XP but not in Windows 7 64 bit. You can copy this folder as one if you want to keep it as a single "driver package". This will typically reside in a folder containg 4 or 5 files. Download the drivers from the Prolific website, install them and use search for the file ser2pl.inf. In Linux this is pretty easy and as I write this PID 0609 is already associated with the pl2303 driver by default.In Windows some inf modding does the trick. However, to make matters even more annoying, the PL2303 chip, which typically identifies itself as VID 067B and PID 2303, reports PID 0609 in this device, making it impossible to recognize this as a standard serial to usb converter.The easiest solution for this is to modify the drivers so that they identify also with that PID.
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