I know this an old post but referenced by many I'm sure.
The B9903 info is inadequate.
Needs to say "do not open v7.5 tune until key is on.
Nothing says "HOW" to get the software or where to find it. Is setting B9903 to "Applied" actually installs the patch??
For us newbies, it would help if the "Full Flash" process was explained.

I'm finding this site very frustrating because even though there is al lot of info, it feels like the "experts" are expecting us newbies to know where all settings/parameters are. NOT!
It's like setting up an app on your. someone takes your phone and makes adjustments or changes settings and says there-you-go.
They did not show you anything so you have no idea what they did or how to change it.
Maybe when explaining a setting/parameter; saying:
open v7.5 tune
open tuning file (file menu, open tuning file, select file to manage from list of store/saved files)
Put parameter (B9903) in search

I know it takes time to do this but we can't learn if no one tells us.
It takes more 2x or 3x the time for us to find what someone suggested than it takes you to time in details.

So there is my rant. Now Ill go back and read for more hours to understand the popups I get when trying to "Flash" my e38 ecm.
Sorry if I offended anyone...just frustrated. (hope someone reads this )