My experience with a laptop GT1

[Alpina B10 V8 Touring]

Greetings! I was wondering if you guys have tried recoding the navigation of the E53? I have a Mark III navi unit in my E39 540. I know it has basically the same hardware and the procedures might be the same albeit I have to enter a different vehicle. I was thinking of changing the voices, the provider settings, the region, etc. The original German settings reverted back to European settings which can happen when playing around in upgrading the software version but then having to downgrade to a lower version and then upgrade again to the latest version. My stealership has the latest v55, I think, of the GT1 but that cannot program or code. I might be able to get my hands on a v43 for a while. I was wondering if you guy can post pics to guide me since I am not that familiar with the system. Thanks in advance for any help. Cheers!