What is this version update?
This appears to be a fine update to me. If you check this page on sammobile, it has firmwares named similar to yours. The final base number is pretty same (UIBOJ3).

Besides that, android phones cannot be hacked that way unless you install some real (real) bad app, even then you should be able to recognize such a thing. So I would say just go ahead, this update is fine from security point of view :)