Is the stock file, 4Z7907551R.bin, 250HP or 265HP?

Not really.  Take a look at the other stage I projects and learn the maps that are needed by name. 

These will be a good start:

LDRXN/ZK to increase load
LAMFA for fuel enrighment
KFZW/2 for timing adjustments

I've had no issues getting my allroad's ecu (7.1.1) into bootmode.  I've had issues with some ecus here and there.  Sometimes you just can't do it via obdII or bootmode.  You should make another thread on this if you want to discuss it more detail.

So who's ready to start making changes and taking logs?  I already have my allroad tuned so I can provide whatever is needed kick start the process.

Maybe we could compare the following values in your tuned ECU against those of a stock ECU?
As noted prior:
LDRXN/ZK to increase load
LAMFA for fuel enrighment
KFZW/2 for timing adjustments

Attached is the ME7Logger config file that I use for my allroad.  This should cover just about every variable that you'd need to look at for a stage I tune.

I also wrote a EEProm tool into visualme7logger so you don't have to think about it.  Makes for easy cloning.

Since there are potential issues reading the original file from an allroad with nefmoto, attached is the original bin file that we will tune in this project.  I found it on nyet's site.  http://nyet.org/cars/files/stock/

You will then use ME7Logger (me7info really) to create the ecu file from this bin.  With VisualME7Logger, here's the step by step.

1) Tools -> Create ECU file.  Select the attached bin file.  Click OK to loading the ecu file now.
2) File -> Load Config File.  Select the previously attached config file.  You will notice a bunch of the measurements are now selected.
3) File -> Save Settings.  This will save the selected ECU file and config file settings for the next time you open visual logger.

Provided that you have all of the communication settings correct in Options screen, you should be able to log now.  There is a chance that your allroad does not have the 551R file on the ecu, and in that case, this won't work.  You have two options:
1) Write this stock 551R file to your ecu with Nefmoto (even though this is an original file, please verify the checksums before writing)
2) Read the file from your ecu with Nefmoto and use that as the bin file in the above step 1.  Keep in mind, for this project you will have to switch to 551R anyway and there are also potential issues with reading the ecu with nefmoto on these allroads, so I would just recommend flashing the 551R file to your ecu if that's not the file that's already on it.