I'm still at this problem now moved to Debian 12. Driver is compiled and installed. The USB-WLAN-Stick is working after re-plugging after boot but not while booting.

After booting
Bus 001 Device 003: ID 0bda:1a2b Realtek Semiconductor Corp. RTL8188GU 802.11n WLAN Adapter (Driver CDROM Mode)

This ...

Thanks a lot for keeping track on that problem.
But sorry, this was a bit to fast for me. Can you break it down a bit for me please.

So the problem is solved?

But what was the problem?

No the device is not ready then because an wlan1 does not appear.

$ sudo usb_modeswitch -W -K -v 0bda -p 1a2b
[sudo] Passwort für user:
Take all parameters from the command line


* usb_modeswitch: handle USB devices with multiple modes
* Version 2.6.1 (C) Josua Dietze 2017
* Based on libusb1 ...

The comments for SetStorageDelay in the config file mention that this influence "delay_use".
But it does not explain what "delay_use" is or where it comes from. Please improve this comment to point out that this is a kernel parameter and maybe link also to a documentation about it.
e.g. https://www ...

X-Post: https://debianforum.de/forum/viewtopic.php?t=182755

The main problem is that the modeswitching does not work when the system boots. But after plug off and re-plug the USB-WLAN-Stick it works well and a network device appears. So it seams that modeswitch itself works for that device. There ...