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If you have any doubt, read more information about OTA Updates in the following link.
OTA Updates Info Specific Manufacturer Software If the manufacturer provides a specific software, such as KIES application (Samsung) or PCCompanion (Sony), the program itself will download the appropriate ROM files depending on model, country...
We recommend you to ensure battery is full charged and you're connected to a WIFI network because the update can require to download many files.
Being root, get root access or superuser permissions is fully legal and gives you the entire control over your Android OS device as if it were you own PC. Custom roms have their own updates and, most of them, have been uploaded in forums or the web where you downloaded it.
Usually to update a firmware available via over the air, but if your vendor doesn't provide this method, you can update it manually.