michal_kovac Hello!
Please check that you have correctly configured the APN on the tracker, and that everything is fine with the SIM card or chip that you use with the tracker, that there are enough funds and that the data transfer limits are not exceeded.
If everything is fine with this, then please try to identify your tracker on id.wialon.net as one of the devices Xexun TK 102-2.
If your tracker is determined, take a screenshot, write down the name of the model of the tracker and the identified ID (may coincide with the IMEI, may be part of it with zero or without).
After that, return to the application in the unit settings (unit menu - Settings - Common Settings), specify the determined model and ID. After that, configure the tracker on the defined server and port.