ZLT KJ33 5G Router - Firmware Flash

I have one 5G router model (ZLT KJ33) that is currently locked with one particular ISP, I have moved out from the country into another one and I want to re-use the same router but with a different ISP now, anyone has the firmware for this particular router, and to help me out with step by step on how to flash it with the new firmware, to unlock it for any ISP SIM card? thanks in advance.

This router is not supported by OpenWrt. Please ask the manufacturer if they have firmware for you to use.

Hello Psherman, thank you for your quick reply, this is noted.