TK103B gprs problem

hello,
I have problem with tk103b tracker.
I send sms command:

• begin123456 reply: begin ok!
• adminip123456 xxx.xxx.xxx.xxx yyyy (traccar server ip and port), reply : adminip ok!
• apn123456 internet (my ISP APN)
• gprs123456, reply gprs ok!
• fix030s***n123456, reply: fix ok!
  Other devices work with my traccar server, but this tk103 device dont send anything over gprs (if I call to this device i will receive sms with link to my actual gps position)
  GPRS in sim card is enable - I tested it with two SIM cards, also with card worked in another tracker

On sms chceck123456 I received:

PowerOn/12,19 battery:100% GPS OK ACC ON Door OFF GSM Signal 21 Monitor OFF APN:internet IP: x.x.x.x/y (traccar ip/port)

Check this guide:

https://www.traccar.org/troubleshooting/

hello,
thanks for reply.
I chcecked log file and I dont have anything info from this tracker (I have other tracker on port 55023, I tested tk103 on port 55023, 55001 55002 and I dont see anything). I have open ports from 55000 to 55999 (Synology) and it works.
I know about the problem is in tracker. Maybe I must send other sms command to my tracker or upgrade firmware. Unfortunately seller don't reply me.

You can try to find some thread about the same device and ask there.

(I have other tracker on port 55023, I tested tk103 on port 55023, 55001 55002 and I dont see anything). I have open ports from 55000 to 55999 (Synology)

55xxx ???
I suppose the above is an error and the tests will be doing with 5xxx ports (5001, 5002, 5006, 5013, 5023, 5036, 5093, ...)

55xxx are default ports on Synology.