USB modem not not working

Hi i have configure my USB modem on o RB951G-2HND
after the connexion the RB was working well til i decide to restart and after then, no more working
Vendor: Qualcomm, Incorporated
Name: Qualcomm CDMA Technologies MSM
SN: 1234567890ABCDEF
Vendor ID: 0x05c6
Device ID: 0xf000
On the Ports list i have this
Capture1.JPG
i’m note abel to have internet back using the USB modem
Please need help

Did you create the PPP interface?

I followed this quick tutorial with a Huawei E397u: https://blog.ligos.net/2018-03-01/Mikrotik-And-LTE-via-USB-and-Failover.html