Please don't post the same thread in more than one section of this forum. See Rule 8 of our Forum Rules. Also, I'm not sure why you posted this question in the Windows CE 1.0x and Windows CE 2.0 forums, since those versions of Windows CE came out far earlier than the first iPAQ. (The first iPAQ ran Pocket PC 2002, which was based on Windows CE 3.0.)
The is no such thing as an Ipaq 2015 as far as I know. There was a Compaq 2015c however. It came from HP with either the CE2.0 ROM or the CE2.11 HPC/Pro ROM. They are hardware configured and you cannot download or flash a new operating system onto either one.
Nice catch, Rich. That's the first time I've seen the iPAQ label put on an H/PC. Being a Pocket PC dummy (on purpose), I assumed there was an iPAQ 2015.