After a few hours trial and error on my PPC  last night, It has been proved by evidence this article from the Russian Professional BBS can be used into updating ur PPC. very  terrifiic  Good luck；） 大家今天都升级了没？总体上看，速度非常快，当然ROM要在128以上更好；界面是VIsta的风格，非常漂亮。还有，个人认为199版本速度不如271，而且新版本通过DIY，扩展性和稳定性得到极大提升，操作更加人性化，虽然少了生物指纹识别技术，但是可以DIY32位增强型密码。 早上起床变成熊猫眼了，不过看着新系统，看看新装的14M雅黑字体，心中多少感到欣慰，一个字爽，两个字超爽，不管那么多了先体验下自己量身定做的系统再说；）
 Please Note: As of 10/8/07 there are 2 confirmed working roms for hx2*** series ipaqs. So far the pdaviet version is more stable, less activesync issues, preinstalled software ie: psshutxp and much more. (could use more feedback from others on this)

As promised: Here are the steps
-take out any cf/sd cards you might have installed. grab your cradle AND ac power cord (no AC cord = no flashing for you)
-put device into normal boot loadermode and downgrade to 1.0h w/files from hp website.
-format the p.s. (fyi everyone misses you have to HOLD DOWN the keys for p.s. format for like 4 or 5 seconds and THEN it will activate) After p.s. format wm5 will start.
(!! Start below this line if you are performing a wm6-4pda to wm6-pdaviet upgrade or vise versa !!)
-put device into WHITE bootloader mode and again run the 1.0h rom setup. When you arrive at the screen that asks "update" or "cancel",
1. rename the wm5.xxx.nbf to wm5.xxx.nbf.old
2. rename the new wm6.xx.nbf from the 4pda.rar/pdaviet file to whatever your wm5-wm5.xxxx.nbf was called (before you added the .old to it)

-NOW hit update. You shouldnt get any errors.
-After update wm6 wont start properly until you again format the p.s. (remember to hold down those keys to start) once this is done
-you should be golden.. with a working copy of wm6 on your wm5 deivce.

**FYI: With the 4pda update, I didnt LOSE any installed apps, data etc. I just installed all the wm6 versions of any apps I had over the wm5 vers. Very awsome!
** However when I performed the pdaviet rom update I DID. But its okay I needed to do this anyway (always good to start fresh with a new os install)

Bootloader Key Sequences (confirmed on 2490b, 2790b) msg me and ill add more if needed

Normal Bootloader Mode:
contacts + mail + reset -let go and press calendar to activate

White Screen Bootloader Mode:
contacts + itask + reset -let go and press calendar to activate

Format P.S. (hold down until activated)(screen will say formating p.s. when activated):
contacts + messaging + power + reset
OR (I had to use this to format the p.s. after the PDAVIET rom upgrade)
calender + power + messaging + reset, release reset - release all


Links to files you will need:

This will get you back to factory default for hx2XXX series ppc w/wm5
Version: 1.00 (17 Apr 2006)
Operating System(s): Microsoft Windows Mobile 5.0
File name: sp32408.exe (29 MB)
http://h20000.www2.hp.com/bizsupport...23 485-108601

This will get you back to 1.02 if you bail on this upgrade to wm6 (this ones for hx2xxxb (B!) i dont know if it sthe same for non-B devices
Version: 1.02 (15 Jun 2006)
Operating System(s): Microsoft Windows Mobile 5.0
File name: sp33003.exe (29 MB)
http://h20000.www2.hp.com/bizsupport...23 561-108719

4PDA WM6 for HP iPAQ 2*** series:

http://4pda.ru/forum/index.php?showtopic=52176
Direct Link to Rom
http://rapidshare.com/files/53282580/WM06.rar.html

PDAViet WM6 for HP iPAQ 2*** series: PREFERRED OVER 4PDA ROM

http://pdaviet.net/showthread.php?t=13245
Direct Link to Rom
1/2 http://tom-love.net/ROM/HP/WM6.0_5.0...2000.part1.rar
2/2 http://rapidshare.com/files/60450793...part2.rar.html
(.rar was created as multipart file, why? I donno.)

WM2003, WM5, Crossbow Boot Screen Replacements:
See Attachment to this post for easy to use cab installers. (basically, copy to device and run)

Windows Live Messenger:
http://rs104.rapidshare.com/files/24...ows_Mobile.rar

kozhura's AKU3_52_hx2000 (WM 5.0 English) for IPAQ hx2000 series:
http://forum.xda-developers.com/show...ghlight=hx2000

BT Phone Manager (Incase your missing it):
http://forum.xda-developers.com/show...=1#post1518916


NOW I can finally say to everyone who made this possible... .THANKS A MILLION!!!!!!!!!!!!!!
(thanks to the people in this thread who did most of the coding/research on this and were
kind enough to share it with the rest of us)

!!NOTE!! If you brick your pda DONT MESSAGE ME, try running a p.s. before you panic. Then if that doesnt work, put your device back into whiteboot loader mode and run the rom update utility that came WITH YOUR DEVICE. if you dont have it, download it, run it, and if needed perform a p.s. format on your device at the end. This will fix it. Trust me.