Sending Assisted GNSS (A-GNSS) to Bangle 2 GPS (AT6558)

Is there a specific feature you're trying to access? At the moment it just looks like you're fishing.

Also, as someone who has worked in the commercial embedded world for many years, "SMA ... probably got all current docs, binaries and support from them. They, as a big customer, also can request firmware updates." is just fundamentally incorrect in every respect. Half the time the documentation is provided under NDA, the other half of the time the documentation simply doesn't exist at all. And finally, even if SMA had some secret firmware update they weren't bothering to pass on to customers, why would they turn around and give it to us? They might be a big customer, but we aren't.