With my E5, if I well remember:
a) in system setting/devel mode set the pin (4 numbers)
b) I don't remember now if it is also necessary to set devel mode “on“

then in the terminal:

1. android-gadget-service enable rndis
2. sudo tethering enable (the phone ask the pin...)

of course 'hotspot' and 'mobile radio data' must be set “on“.

At "the end“:

3. sudo... disable

4. android...disable rndis

5. 'hotspot' off

6. 'wireless network' off (set on by hotspot)

7. 'mobile radio data' off

reset also pin (if you want) and devel mode.

Yes !
Now it is even more evident, comparing the two methods listed !

I prefer wifi/wlan, but recently in a ... winz@w ... notebook (not mine) and a “vpn“ / network that kept crashing, usb has fixed it.

@luksus OK Thanks!
Errata Corrige: "polar white" (a little dyslexic...!)

A question:
give it a try with "installer"... or directly manually?

@luksus
OK!
I've got a x605 "polar withe“ with less memory (2 GB and 16 GB) but "brand new" (via Ebay).
I already updated it to Android 9 (from 8).
In the coming days I will try...

Thanks!
.

Any news?

@arubislander
And what about Comdirect PhotoTan?
https://www.comdirect.de/cms/sicherheit-pin-tan.html#nutzung_desktop
(and I think a similar situation for DKB)

The base app also works without SIM and without net (like a "token" generator)

There is no problem if PIN security is set to "off", but I figure out...

There is no problem if you use one SIM for "data" (e.g. SIM 1, that it is "/usr/ofono...ril_0") and you toggle the other one (SIM 2, "usr/...ril_1") off/on.

But if you switch off the SIM on which "cellular data" is "on", the phone automatically switches "cellular data" to the other SIM and this remains even also restoring "on" the previous SIM: you have to manually reset it in the "settings".

Be careful!
This happens even if "cellular data" is turned off before taking action. "Cellular data" will be active on the other sim anyway!

@UdenGoogle
Yes ! Just “touch screen“ for everything...
(maybe in future, wo can said).

Yes !
Now it is even more evident, comparing the two methods listed !

I prefer wifi/wlan, but recently in a ... winz@w ... notebook (not mine) and a “vpn“ / network that kept crashing, usb has fixed it.

With my E5, if I well remember:
a) in system setting/devel mode set the pin (4 numbers)
b) I don't remember now if it is also necessary to set devel mode “on“

then in the terminal:

1. android-gadget-service enable rndis
2. sudo tethering enable (the phone ask the pin...)

of course 'hotspot' and 'mobile radio data' must be set “on“.

At "the end“:

3. sudo... disable

4. android...disable rndis

5. 'hotspot' off

6. 'wireless network' off (set on by hotspot)

7. 'mobile radio data' off

reset also pin (if you want) and devel mode.

@Ubuntu-Schommel
Ich habe eine Frage: hast Du noch der bq E5? Ich habe eine Problem mit alle eingehenden Anrufen > Kein “Telefon“ app (Fenster).
I've a question: Do you still have the bq E5? I have a problem on all incoming calls > no “phone“ app/windows.

Sorry for broken english and/und tut mir Leid fur die deutschen Fehler !

@pixelated
Me too... [bq Aquaris E5 HD]