Download And Flash Stock Android Marshmallow 6.0 For Germany Generic Sony Xperia Z4 Tablet LTE SGP771 Rom Version 32.1.A.1.185 Firmware FTF.water proof design is simultaneously sleek and solid., it features a colorful user-friendly overlay.
Sony Xperia Z4 Tablet LTE SGP771 Germany Generic Stock Rom 32.1.A.1.185 Installation Guide
a) First of All go to Setting And check your Firmware verison If have Already Latest one Skipped this thread
b) Newest Version of Xperia Flash-Tool Download from HERE
c) download Germany Generic Marshmallow 6.0 for Sony XPERIA Z4 Tablet SGP771
d) now paste the Firmware ftf file which you downloaded in step c) to folder „Firmware“ included within the Sony Xperia Flash-tool
e) Now Start The XPERIA Flash-tool in you PC, click on Install and Select downloaded firmware, After than click on OK. NOTE: if you do not want to delete any Data of your Device, simply unchecked installing userdata.Sin file. Now Data will remain in your Device, however usually it might probably reason further Issues. So it is Recommended (and that i Suggested that) to do the backup of your Device data, than proceed with Smooth & Clean Installation after then restore your Personal data.
F) Turn OFF your Device and when Flash-tool Show’s pop up window, connect Xperia to computer with Holding volume down Key.
g) after Few Minutes All Installation is Done and your Phone will get the Latest firmware
Unlock Bootlaoder Guide HERE
Lock Bootloader Guide HERE
Download Stock Marshmallow 6.0.1 Firmware FTF For Germany Generic Xperia Z4 Tablet Wifi SGP771
SGP771_32.1.A.1.185_R4C Germany Generic.ftf HERE