1. how to install the newest Android 4.4.4for Sony XPERIA Z C6603
a) first of all, check your firmware version
(if you already have the newest one, you do not need this tutorial)
d) paste the ftf file downloaded in step c) to folder „Firmware“ included in the XPERIA
Flashtool
e) open the XPERIA
Flashtool, click on flash and choose downloaded firmware, than click ok. Important - if you do not want to delete any data of your phone, just uncheck flashing userdata.sin file. All data will remain in your phone, but sometimes it can cause additional troubles. So it is better (and I recommend that) to do the backup of your personal data, than proceed with clean instalation and then restore your personal data.
f) turn off your phone and when
Flashtool shows pop up window, connect phone to PC with holding volume down button
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