Sony Xperia SGP311 Stock Firmware (flash file) download from below direct link.
Firmware, Flash Tool, Driver and Instructions available at post end.
Model: Sony Xperia Tablet Z SGP311.
Flash Tool: Sony Mobile Flasher.
Download
Sony_Xperia_Tablet_Z_WiFi_SGP311 – Download
How To Flash
Click here to view complete flashing instructions.
Firmware Information
[*] Software Version: SGP311_10.7.A.0.222_1272-8306_HK_SA_SG_MY_AE_KW
Android Version: v5.1.1