Just like March Security, Samsung also started rolling the April 2018 security patch for Galaxy J8 (SM-J810M). The update bumps the build number to J810MUBU1ARF3 / J810MUBU1ARF4 which brings the fixes seven critical vulnerabilities that were found in the Android OS and also fixes a couple of other high and moderate-risk vulnerabilities. Yes, this update is still based on Android 8.0 Oreo. Now download and install J810MUBU1ARF3 / J810MUBU1ARF4 April 2018 Security Patch on Samsung Galaxy J8.