what my primary issue is not to update the firmware version. But the issue is that I'm unable to use the tp-link router as extender mode. Whenever I use it as range extender mode with my main router...

@terziyski I'm from India. The screenshot that you have asked for

@terziyski I've checked everywhere but no Location code has been printed neither on router nor on the box.

@Kevin_Z I'm having the issue while upgrading the firmware version. And I want to upgrade the firmware version because its not working fine as extender mode

I have tried to upgrade my firmware version and whenever I upload the updated firmware file it shows a error code 4503 and an error message " The file is not accepted". I want to upgrade my firmware...