Repurposing or unlocking GPS tracker

I have a what appears to be a GPS tracker. Model R12L(E) VER:F previously used with WhatsGPS or so it seems with the old sticker that was on it. I happened to pick this up amongst a pile of used electronics on the street. No sim in it though.

I did some attempts at getting a response from it via SMS commands after adding a sim but it's gave no response.

Symptoms:

• GSM registers (LEDs OK, SIM works)

• Rings once then voicemail

• Ignores all SMS commands

• No reset button

I believe it’s admin-locked at firmware level. Any way to bypass this so I could set it up with something like traccar ?