The Huawei tablet in the physical store has been unpacked. Can I exchange it?

You can't. If we haven't opened the package and activated it, we can buy it in this physical store and find some problems when we go home, then we can exchange it in Huawei's physical store, but if we buy the tablet online, we can't go to the physical store to check the hidden dangers. After all, it's not the same store, so we can't change the tablet in Huawei's physical store.