[Omnia 7 Windows Phone 7 Development] Heathcliff74:
I just wanted to say that I flashed my device and all went well. Phew!! Network access (Internet Explorer / Marketplace) is noticably faster.

A few notes for people who are scared to perform a ROM upgrade and who are not experienced ROM flashers, like me. Some of these notes are in previous posts, but I'll aggregate them here for convenience:

First I had to make a jig, because I had a 'bad' bootloader, which did not allow me to go in download-mode. I used this guide. If you're gonna do that too, then you should pay attention to these things:

The guide refers to pin 4 and 5 being closest to the headphone socket. But on the omnia 7, the headphone and micro-usb sockets are the other way around if you compare it to the Galaxy S. The guide is for the Galaxy S, so you should really pay attention to which pins you solder the resistor(s). This is the best picture on how you should solder the resistor(s).

Many micro-usb cables have no wire for pin 4. Some connectors don't even have a pin 4. You should first verify that your connector has all 5 pins. If you only have 4 wires, then you have to dismantle the connector and solder directly on the back of the connector.

I switched off my Omnia 7. I plugged in my jig and it went to downloadmode immediately.

For flashing I downloaded XENJK1 (see threadstart) for the European version, the flash program, the drivers and the pdf guide. Following the guide is quite simple and comes down to the following steps.

DISCLAIMER / WARNING: These steps are only for informational purposes only. Please read the official guide thoroughly. I will not take any responsibility for damages caused directly or indirectly by following these steps!!

Switch off the phone and disconnect it.

Get the phone into downloadmode by either inserting the jig or use the 3-key-combination. You can immediately remove the jig when it is in downloadmode.

Start the flash program on your PC.

Connect the phone to your PC. You should see the drivers being installed and the see an active COM connection in the flash-tool.

Select the four files from firmware archive that you downloaded.

Click start.

Now all should go automatically. But there were some steps that scared me. After phone rebooted for the fist time during the process it first showed me a Samsung Omnia logo and then a screen with a phone and a computer with an arrow and a red cross over the arrow. This may look like something is wrong, but this is ok. After a few moments you'll see another progressbar and when it's finished your phone will reboot again. The update looks to be finished and after that reboot your phone will ask for the primary configuration settings. In the meanwhile the flash-program is still showing me a progressbar for "Rebuilding". I guess it does that so you don't disconnect it yet. To be sure I just waited for that progressbar to finish too.

After the reboot, only few data has survived the flash. That is: only the data on remote servers, like your contacts, calendar and email. All other apps, data and settings are gone! Keep that in mind.

The first few minutes of use, the phone did not react very smooth. I guess there were some background threads active for initialization purposes. After a few minutes of usage all was smooth again.