AT&T Pushes March Security Update For Samsung Galaxy Express Prime and Express 3

Samsung Galaxy Express prime

AT&T has rolled out March security update for Samsung Galaxy Express Prime and Galaxy Express 3 smartphones. If you are in the US with the two smartphones, you will receive a message notification prompting you to download the update. Based on the geographical location, it will take few days for the update to hit your handset.

With baseband version J120AUCU2AQC1, the March security update is being rolled out to Samsung Galaxy Express 3 bearing model number J120A. The Kernel version is 3.10.9-7662162 and the build number of the update is tagged as MMB29K.J120AUCU2AQC1.

Samsung Galaxy Express 3

Moreover, you need to install the previous build number ending with PJ2 or QB1. You should note that the size of the file is 21MB. According to the official support page, the March security update provides fixes for issues associated with VoLTE mute, RTCP jitter including Rx audio.

Samsung Galaxy Express prime, on the other hand, carries a Baseband version of J320AUCU2AQC1 coupled with kernel version 3.10.9-7663112. With build number MMB29K.J320AUCU2AQC1, you have to install the previous version with build number ending with PJ2 or QA1.

Samsung Galaxy Express prime

Moreover, the size of the update is comparatively larger at 428MB. Interestingly, the update provides the same bug fixes as in the Galaxy Express 3. We wonder why the size of the update is very large for the handset.

AT&T has started to roll out the March security update in a phased manner. Hence, it will take few days for the update to hit your handset. If you are not willing to wait, you can manually verify the presence of the update by tapping Settings | About device | System updates.

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Before tapping the download button, you should establish connectivity with the Wi-Fi and also completely charge the phone to full capacity for an uninterrupted update process.

Anand Narayanaswamy is the editor-in-chief of Netans. He was recognized as a Microsoft Most Valuable Professional (MVP) for 9 years (2002 to 2011) and again as a Microsoft MVP in Surface under Windows and Devices in January 2024. He worked as a Chief Technical Editor with ASPAlliance and was part of ASPInsider program. Anand has published several articles and reviews related to various software and hardware products for various software and technology related websites. He is also active on social media and also participates as an Influencer for various brands. Anand can be reached at