I am from Bangladesh.

I bought a tp-link router about 2 months ago. While setuping my router, I noticed that there is no option of BANGLADESH in region. I tried in many ways, but couldn't find the solution. Then, I thought, maybe tp-link is not registered in Bangladesh. But today, I found out tplink's official website of Bangladesh.
Then, I started again to fix my problem. But I failed. Please, solve my problem, Otherwise, I'm unable to upgrade the firmware of router.

I am giving a screenshot of my problem. Please solve it as soon as possible and instruct me what should I do.

Note: There is no BANGLADESH option in region!