HP have not officially released such an upgrade, but some enterprising folk have managed to release a Windows Mobile 6.1 upgrade ROM for the iPAQ 614.
Please not that this is completely unsupported, comes without any warranty and could well brick your device!
Basic instructions:
1) If the ROM is compressed, extract the file flash.dio from the archive (e.g., zip or rar file) using the password "israpda.com" for the newer ROMs, or "PDAclan.com" for the older ones (note that the "PDA" part is capitalized).
2) Copy the file flash.dio to an micro sd card formatted to FAT 16. Do NOT use an SDHC card, the bootloader can't read it!
3) Insert the card into your 610/612/614. While it's still off, hold down the voice record (left side) and mute (top) buttons.
4) Still holding the buttons, hit the power button. Hold them until you see the bootloader start up.
5) Sit back and relax! I'd recommend that you don't touch anything until it's totally finished and the screen comes up telling you to calibrate the touchscreen. Enjoy your new ROM!
German ROM
http://rapidshare.com/files/188317993/614c_German.zipenglish ROM Standard version
http://rapidshare.com/files/177901384/20270_rev1.2fix_standart.rar.htmlenglish ROM Manila 2D verson
http://rapidshare.com/files/177898513/20270_rev1.2_fix-m2d.rar.htmlThe source of this news and lots of debate and problem fixes are being discussed over at
xda-developers and also in another thread
here.