Read-Only Memory (ROM) contains the programming which enables computer to be “booted-up” or regenerated every single time whenever you turn it ON. It’s also known as a memory hardware which enables a fast access to permanently stored data but prevents addition to or modification of the data.
An over-the-air update (OTA Update) is a wireless delivery of new software updates or data to smartphones and tablets. As wireless carriers use the method of over-the-air updates to deploy [glossary id=’16317′ slug=’firmware’ /] and configure phones for use on their networks. Settings → More → About Device → Software update → Update.