The current software is 10.2.
If you try reverting to iOS 10.2 when Apple is signing a different software, it will not work. During the installation process, iTunes connects to Apple's servers to make sure you don't install software not signed by them. You'll get error 3194, and it will not be possible to proceed.
So: no, you can't use your blobs to go back to 10.2 once it's not signed any more.