Sony Stock Firmware Sony Xperia X (Compact) (Performance) receive October 2017 Security Patch [Downloads]
Sony News Stock Firmware Install August 2017 security patch for Sony Xperia X, XZ and X Performance – FTF firmware download
Sony Android 7.1 Nougat Install July 2017 security patch for Sony Xperia X series phones [34.3.A.0.206]