HereLink lost Product Key

Hello,
I have Herelink that was witting for long time and I decided to use it once more.
It was not able to connect to air unit, so i did factory default.
Now it is asking me for Product key. I was trying to locate it but no luck.
Also I am not able to find details on seller. No idea where original invoice was lost.
Is there any way I can recover key or my HereLink is just e-waste right now?

Hi, please provide the SN from the back of the device, and also the android number via Settings->System->About Phone->Model->Serial number, thanks.

Hello, thanks for response. Here are details

Air unit model: HX4-06074 SN: HX4060749500912
Ground unit model HX4-06075 SN:HX4060759500465 and serial number from settings : 62949c93

Hi,

Here is the key for your device.

BGQT-7FK5-LGQH-VWXK 62949c93