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I ran into the same issue with a H4150. Pull the main battery and let it sit without the battery for a while; a few seconds is not long enough. I let it sit for about two minutes and that was long enough on each of the four times I needed to recover from a failed ROM upgrade last night. This reset the H4150 and it then initialized like it was just out of the box; all data and settings were reset to original. Some troubleshooting procedures indicate you should not use a USB hub for this process. That did not work for me-the ROM upgrade still breaks the connection just after getting started. But at least pulling the battery got the iPAQ back to a useable condition. My next test will be to try it from an old PC with Windows 98 and USB 1.1 or 1.0. Maybe the brief disconnection is normal and a fast PC with a modern OS may not be as forgiving to brief upsets. Just as the ROM update really begins (after all the handshaking), the iPAQ briefly drops the connection and that's when the update fails, it just takes a little longer for the software to say 'hey-I've lost communication with the iPAQ...'
I suggest to you to buy a new battery for you HP iPAQ H4150 Pocket PC and see if that charger will charge it up. If the new battery does charge then the problem was with the old battery.
If it doesn't charge up on the new battery then, your problem lies with the battery charger. You should check that the voltage of the battery charger is compatible to charge the voltage of the battery.
thanks for the post.
the first thing is to install the ipac software and try see if the syetm can sysnc.
when properly configured there should be an ipac icon in my computer, open this folderand other sub folders will be visible,if you have an SD card media in this device it will be visibleas well. try copy the music of your choice from the system into the music folder or your sd card depending on your pref.