[HD2 Android NAND Development] ph03n!x:
Did you change the system partition to 260 MB?

Quoting from OP:

ROMs before 1.9 needed a 200 MB system partition. This one needs 260 MB - so yes, you will have to do a full wipe.

You did something wrong - root is perfectly working.

Quoting from OP:

So no - atleast not the one built in. Get an app from the Market.

Install SMS Backup+ and backup your SMS and Call logs to your GMail account. Install this ROM after a full wipe, reinstall SMS Backup+, restore your contacts (and SMS if you need them).

Use TitaniumBackup from the Market to backup all your apps + data

Use SMS Backup + to backup your SMS and Call Logs

Power down the phone

Boot to recovery by holding the power key while powering it back on

Got to Backup and Restore, do a Backup

Power down through the menu again (back and Power off)

Remove the SD Card, copy the TitaniumBackup and clockworkmod folders from the SD Card to some place safe on the computer

Put the SD Card back in

Down load this tool (Thread) and extract the contents to a folder in your desktop (assuming you are on Windows)

Hold down the vol key and reboot the phone

Ensure you are on the screen with the tricolor, connect to the computer

- if you have used bootloader mode before, you're fine. Else Windows will install the Qualcomm CDMA drivers from Windows Update (my Win7 did, I have set device installation settings to look in Win Update if no drivers are found locally), and then the Windows Mobile Device Center

- wait for the display to say USB from Serial

Run the HD Installer from the folder in your desktop

Choose Wipe (Task 29), follow instructions.

When the process reaches 100% and phone reboots, hold the volume to get back to the tricolor screen

In the tool, choose cLK repartition from the right side box (System Partition Size (cLK)) choose 260 MB, and 5 MB Cache. Click on Repartition

When the process reaches 100% and the phone reboots, hold the Back button on the phone to get to Fast Boot mode (Black screen on the phone with some text)

- windows must find a new device now. If you have not used cLK's fastboot mode before, you need to install the android adb driver.

- ensure the android adb device is installed, and is without any yellow ! or ? in device manager

Click on cLK Install Recovery on the tool, click update

When the process completes and phone reboots, hold the home key to get into recovery mode

In clockworkmod, go to advanced

Choose partition SD Card, select 1024 MB partition, and 0 MB for cache

After it is done, power down, remove the SD Card and copy theses two files from the OP:

Copy the TitaniumBackup folder that you had copied to your computer earlier to the SD Card

Put the SD Card back to the phone, reboot to recovery by pressing the home key during power on

Choose install Zip from SD Card

Choose the file named LeoRCMixS_v.1.9_MAGLDR_Krendelrus.zip

After that is done, choose the file named LeoRCMixS_v.1.9_cLK_kernel_RAF_R1.9OC.zip

After that too is done, choose Go Back in clockworkmod, and restart

On the first boot, do not configure an account, rather just get through with the process of setting it up with a wifi

- if you have a problem setting up wifi (errors out), dont panic. Skip setting up wifi and go ahead

- after everything is loaded up, give it 15 minutes, restart. Give in 10 min or so, and then setup wifi.

- if wifi (or any setting for that matter of fact) acts up with error, or does not "remember" your setting, reboot to recovery, format cache and wipe dalvik cache

Wait for it to load / settle down (~15 minutes), power off and back on

After boot up, got to settings > applications and allow unknown sources

Complete signing up your google account (Settings > Accounts and Sync)

Go to the market, install TitaniumBackup, and restore your apps

Install / open SMS Backup + and restore your SMS and call logs

Enjoy!

Note- this for installing the cLK version, which I use and recommend.