TL-WR902AC with LTE-Stick

Hi, i want to use a 4G Systems XSStick LTE Plus (VW/SKODA CarStick LTE) with my router.
I found this thread: LTE Stick + Raspberry Pi - #5 by Hoerli but i cant get it to work, i think i don't have the right drivers.

root@OpenWrt:~# cat /sys/kernel/debug/usb/devices

T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=480 MxCh= 1
B: Alloc= 0/800 us ( 0%), #Int= 0, #Iso= 0
D: Ver= 2.00 Cls=09(hub ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=1d6b ProdID=0002 Rev= 5.04
S: Manufacturer=Linux 5.4.188 ehci_hcd
S: Product=EHCI Host Controller
S: SerialNumber=101c0000.ehci
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr= 0mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 4 Ivl=256ms

T: Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 2 Spd=480 MxCh= 0
D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=1c9e ProdID=7605 Rev= 2.00
S: Manufacturer=USB Modem
S: Product=USB Modem
C:* #Ifs= 4 Cfg#= 1 Atr=e0 MxPwr=500mA
I:* If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=(none)
E: Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=01(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 1 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=(none)
E: Ad=83(I) Atr=03(Int.) MxPS= 10 Ivl=32ms
E: Ad=82(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 2 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=(none)
E: Ad=85(I) Atr=03(Int.) MxPS= 10 Ivl=32ms
E: Ad=84(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=03(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 3 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=(none)
E: Ad=87(I) Atr=03(Int.) MxPS= 10 Ivl=32ms
E: Ad=86(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=04(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms

T: Bus=02 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 1
B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0
D: Ver= 1.10 Cls=09(hub ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=1d6b ProdID=0001 Rev= 5.04
S: Manufacturer=Linux 5.4.188 ohci_hcd
S: Product=Generic Platform OHCI controller
S: SerialNumber=101c1000.ohci
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr= 0mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=255ms

I tried configuration in LuCI but there is no ttyUSB
What else can i try?

did you try looking in /dev/?

Try a better modem.
If you want to play with this one, follow https://openwrt.org/docs/guide-user/network/wan/wwan/3gdongle

in ls /dev/ i get this output:

bus              mtd2ro           mtdblock6        ttyS14
console          mtd3             null             ttyS15
cpu_dma_latency  mtd3ro           port             ttyS2
full             mtd4             ppp              ttyS3
gpiochip0        mtd4ro           ptmx             ttyS4
gpiochip1        mtd5             pts              ttyS5
gpiochip2        mtd5ro           random           ttyS6
hwrng            mtd6             shm              ttyS7
kmsg             mtd6ro           tty              ttyS8
log              mtdblock0        ttyS0            ttyS9
mtd0             mtdblock1        ttyS1            urandom
mtd0ro           mtdblock2        ttyS10           watchdog
mtd1             mtdblock3        ttyS11           watchdog0
mtd1ro           mtdblock4        ttyS12           zero
mtd2             mtdblock5        ttyS13

there is no ttyUSB

Obviously, because

This does not look like a common modem type. Test it with Linux on a laptop or desktop first to confirm that Linux supports it, it can connect to the Internet, and which drivers are used.

No need to do that. This modem is supported by the option driver since
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=617c331d91077f896111044628c096802551dc66

But it looks like it only supports PPP mode.