From: http://forum.xda-developers.com/showthread.php?p=9237282

Oke, start from scratch, from last known good update-able version

1. Add in new DSP Manager.
   Check
2. Add in Notification Power Control 2.29.
   Check
3. Adding removed HTC Album to data/app.
   Found first issue with updating to 2.29 with HTC Abum/Gallery in data/app.
4. Added new Flickr, Friendstream, HTC Facebook, HTC SetupWizard, Mail, PluginManager & SetupWizard to Data/app.
   All working as it should. (have to upgrade FriendStream and Pluginmanager or break the FB syncing the rest is part of the team except for Mail)
5. Now moving android_audio.mp3, bravo-keypad.kl & widget.txt to data/local.
   All good widget.txt has no issues with being symlinked, so it can be user customized easily (Why read if you can test yourself)
6. Do a manual install of Calibrator-5.1-Universal.apk without the extra libraries. (I expect the outcome to be a FC)
   Check, I can remove it again.
7. Out with VisualizationWallpapers.apk, LiveWallpapers.apk, HTC_IME_hi22.apk, HtcCopyright.apk, com.htc.WeatherWidget.apk, com.htc.FriendStreamWidget.apk, Clicker_hi.apk.
8. Now adding in updated Calibrate Screen (Data/app) and libsurfaceflinger.so (data/lib) And doing another upgrade from 2010-11-16 without wipe.
   Nope Calibrate screen force closes this way. Alrightee let’s put that file where it is expected to be in System/lib.
   Oke this is where I start getting Bootloops.
   I’m going to try with the older surfaceflinger I used in 11-16 version.
   Checked them they are the same. Let me try Symlinking it then.
   (Yeah I know I’m such an amateur but I just don’t care)
   Final conclusion, I will not include the updated Calibrate screensettings & the accompanying Surflaceflinger.so into the new build.
9. Next on the list is the android.policy.jar file for the reboot power menu options.
   Check working.
10. Move  framework to Data/loca
    Check
11. Make Froyo like skin in UOT online kitchen.
    Check
    

    HTC, @XDA, XDA, Desire, NSA, N.S.A., N.S.A, Cook, Rom , Flashing

12. Add some extra Gingerbread graphics to the skin.
    Check and optimized framework.
    

    HTC, @XDA, XDA, Desire, NSA, N.S.A., N.S.A, Cook, Rom , Flashing

13. Add Gingerbread Keyboard.
14. Remove BugReport

Note need to replace one of the menu backgrounds to lighter froyo version.

First Upgrade issue.
Uninstall Gallery (HTC Album) through regular Settings  >>  Applications  >>  All Applications  >>  Gallery Remove.