First run the NSU as admin then open the data package manager, if you have patched it type your RM-XXX if will show you the FW that is there for the RM and the product code that you need. As you said it is already showing in the list select the product and download again. It should be pretty quick. after that is done go to product support tool for store option go offline and in the main screen click file and select product rm-XXX
It should show your phone there. at the bottom left click on programming and select recovery. DO NOT CONNECT YOUR PHONE INSTEAD SWITCH IT OFF
when you select recovery it will show you the product that is already downloaded from the initial steps. select that and click start.
It will show verification of data integrity.
When it finishes it will show a screen which says application has lost connection with device it will ask you to retry or cancel.
At this step connect the switched off device, it should boot the device. Click retry and leave the device alone.( I mean it. Dont even look at it the the wrong way, it might just brick on you
) after it finishes mucking around with the install it will restart. after it finishes everything you can close SW on comp and disconnect your Brand new phone.
Hope this helps/ It worked for me. I couldnt find the link so typed out everything from memory.