AT 5G band locking commands not working but other commands are working well

Hey can you help me why these commands are throwing these errors.

The module seems like RG500L/RG620T, it do not support the AT command.
Please use the Quectel API.

The module is not like common Quectel 5G module like RM520N/RM500U, it works as Linux Host normally. Quectel didn’t implement such AT command.

It is the RG500L-EU.
How to use Quectel API?
Please share any guide that would be helpful.
Also share the tools required as well.

For example, you can follow the Quectel_RG500L_Series_QuecOpen(SDK)_Cellular_Network_Information_Development_Guide_V1.0.pdf.
Just for test, you need to use adb and login in the modem and run some examples.