I have changed my CSC with SamFW tools, and after that I am not getting any updates.

Good Lock is available in Bangladesh nowSearch on Samsung Store

Remove your sim cards, open a vpn app and connect USA server. I tried with ProtonVPN.Then clear the Samsung Store app data and open the app. You can find the GoodLock application thereI installed few hours ago and it's working perfectly.

Got that. Thank You.

But its says on March 2021.Also I don't receive any update on software updates.