[HD2 Windows Phone 7 Development] warriorvibhu:
Ok I followed the following Steps till now::

Updated Zune to latest

Installed the ROM (Mirror 1) and (Mirror 2) given on first page Post 2 by double clicking DWI. easy peasy then set up my phone by entering live id and activation code.

Connected to zune. Zune found update 7008 .. Updated.

Phone restart. Again connected to Zune. Zune found update 7392. Going on now. Step 7 of update 7.0.7392.0 (Installation on Phone) is a bit time consuming so be patient.

Phone restart and updates completed. Successful, I have Nodo :).

Extract WP7 Update Cab Sender.zip and HD2-7720fix.rar in two different folders. go to hd2 7720 fix folder >>update tool >> x84 or x86 depending on your OS and install.

Now copy the DeviceProvisioning.cab in the same folder as where WP7 Update Cab Sender.zip was extracted..

Now double click the wp7 update cab sender and press S. It will be sent to device and the phone will be restarted more than once and updates would be applied. Anyone getting 4 or more restarts should restart this step.

Now again connect to Zune and it will check for updates. This time it will update to 7403..quickly.. and phone will Restart.

Again connect to Zune and it will check for updates and say 7712 is available .. This one is a big update might take some time to download depending on your connection speed.

Installation is even slower than download be really patient mine is still going on after 1 hour .. i have had coffee .. Lunch everything ..After u see ur phone updating with a progress bar...which will also take some time to appear.....Leave ur phone and return to it only after an hour is gone i would say take 1 hour 30 minutes.::::::: Done the phone is booting Now:::::::

Ok so the phone now shows SD card error and incompatibility. So i selected turn off option on screen and from MAGLDR selected option 1.... and as soon as go go go appears press volue up and volume down together... then a white screen appears with text ..press volume down twice but at an interval of 3 seconds (count to three) . :)

Now the get started screen can be seen.... set time etc.

Now to 7720 :)

Now Extract the HD2-7720fix.rar in a folder with same name and from update tool folder reinstall x86 or x64 whichever appropriate for ur OS.

Now make sure there are no cab files in the folder where you have extracted wp7 update cab sender (Refer step 6).

Reset your phone (Hard or from settings any)

Copy the file

Diff-7.10.7712.60-7.10.7720.68-armv7-Retail-Microsoft.DPI_262.pks

and ....

lang-***.cab

...i selected 0409 and 0809 packages and the file

***pks.cab

. in the folder.

Double click WP7 Update Cab Sender.bat... SELECT S.. wait for update the phone will remain blank for a few seconds may be 30 odd seconds dont panic .. it will soon be done..now the phone will restart twice ..

You will see something like this on your PC when the update process in going on

╔════════════════════════════════════════════════════════════════════╗
║ WP7 Update Cab Sender xboxmod-Yuki 2011 ║
╠════════════════════════════════════════════════════════════════════╝
■
╠══════» S ·(S)end Cabs to device
■
╠══════» B ·Send Cabs to device with (B)ackup
■
╠══════» R ·(R)estore device backup
■
╠══════» L ·Read last Update (L)ogs from device
■
╚══> Your choice: S

╔══════» Creating list of cabs
■
■
╠══════» Updating device
■
UpdateWP version 4.8.2345.0

Applying updates to device
Id: \\?\usb#vid_045e&pid_04ec&mi_00#6&ddaee1d&0&0000#{ca3d7387-f67b
-11da-bbec-8000600fe800}
SN: d1697398 - f65d9698 - d7b2c91a - 463cd22d
Name: HTC HD2
KITLName: QSD8XXX04715326
Manufacturer: HTC
ModelId: 4
Model: HD2
MobileOperator: 000-00
Version: 07.10.07712.03-00.00.00000.00-00.00.00000.00

Checking your phone's status: Completed in 0.02 seconds
Checking system requirements: Completed in 0.2 seconds
Downloading updates: Completed in 2.54 seconds
Checking system requirements: Completed in 0.02 seconds
Transferring updates: Completed in 0.37 seconds
Preparing to install: Completed in 2.03 seconds
Restarting your phone: Completed in 75.19 seconds
Installing updates: Completed in 80.13 seconds
Restarting your phone: Completed in 37 seconds
Completing updates: Completed in 1.74 seconds
The device has been updated to version 07.10.07712.03-00.00.00000.00-00.00.00000
.00
■
╚══════» Done
Press any key to continue . . .

After successful updation YOU HAVE 7720 :) ENJOY start zune and set up your phone and zune .. Put that activation code etc. Also now you can apply the SD-FIX.cab :) and after successful update reset the phone.

ENJOY Friends and Thank all the devs who worked hard on this esp Yuki, Xboxmod, Cotulla, Football, Ondraster and sorry if i forgot someone..

Troubleshooting

http://xdaforums.com/showpost.php?p=17053586&postcount=716