ls /dev/video0 don't work

1.Which seller did you purchase the product(s) from?
Uctronics
2.The Model number of the product(s) you have purchased?
Followd the link on arducam website to uctronics
3.Which Platform are you using the product(s) on?
RPI 4B Kernel 5.4.51-vl7+
4.Which instruction are you following?
https://www.arducam.com/docs/cameras-for-raspberry-pi/ptz-camera/13mp-ptz-camera/
5.Has your product ever worked properly?
no
6.What problems are you experiencing?
Hi everyone,

 

I am trying to run the 13MP PTZ Camera.

 

I followed the arducam instructions. At the step:

[email protected]:~ $ ls /dev/video0
ls: Zugriff auf ‘/dev/video0’ nicht möglich: Datei oder Verzeichnis nicht gefunden

i received an error.

 

Any idears?

 

Tanks for the help

 

Griller
7.What attempts at troubleshooting have you already made?
downgrade Kernel Version Hardware check
8.How would you like us to help you?
make it run

Dear Sir,

Which instruction are you following? Please attach me your hardwre setup diagram and your product picture and I will help you check it in detail. Please send your issue to [email protected]. We will not follow up on the fourum later.