Yes, this method is the official way to upgrade Samsung phones manually.
This will output the MD5 checksum of the wget binary. download one binary buildver hometarmd5 work
A popular, open-source tool that pulls firmware directly from Samsung servers. Highly recommended for speed and accuracy. Yes, this method is the official way to
How to Download and Use One Binary, Buildver, and Hometar.md5 for Android Flashing and Hometar.md5 for Android Flashing