Xperia Z3 Tablet Compact on Android 4, can't upgrade from settings

[piero]

Yes, First install latest available stock android version for the device is a requirement !

@piero

you may want or need to flash first an appropriate Stock Vendor Firmware to your device

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click here to see details

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installation of the Stock Firmware Sony

Flashing Stock Firmware on Sony Devices

If you are using a Windows PC, and you have not unlocked the boot-loader on your device, you can use Sony’s flash tool EMMA to flash the latest stock firmware on your device. Full documentation and download are available on the Sony Developer World website.

Flash tool | Developer World

If you are using a MacOS or Linux PC, or if you have already unlocked the boot-loader, then you will need to use Flashtool

• Downloads for Windows, Linux and MacOS available at http://www.flashtool.net/downloads.php
• Good instructions for use on xperiafirmware.com

Finding the stock firmware

Before you can flash it, you need to find the correct firmware to flash. The EMMA tool - if it works for you - will find and download the latest official Sony firmware for your device automatically.

Otherwise, if you are using a Windows or Linux PC, you can use the XperiFirm ~ Xperia Firmware Downloader to find and download the latest official Sony firmware for your device. (The program is written in .NET and ships as a Windows .exe file, so Linux users will need to install Mono).

If you need access to an older version of the firmware, if you are running a MacOS PC, or if Xperifirm does not find the firmware for your device, then you will need to find the firmware elsewhere on the internet. Places to look include

1. xperiafirmware.com has firmware for many devices, including the following devices with official or unofficial /e/OS builds

• Z3 (z3)
• Z3 Compact (z3c
• [Xperia XZ1 Compact (lilac)][https://xperiafirmware.com/sony-xperia-xz1-compact/]

2. https://xperiastockrom.com has the above, plus

• Xperia Z5 Compact(suzuran) - make sure you choose the correct version for your specific model number
  • E5803
  • E5823

3. XDA Forums - find the forums for your device and then the relevant sub-forums
4. AndroidFileHost - search for your specific model number e.g. https://androidfilehost.com/?w=search&s=D6603

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[HOWTO] an Unified Install Guide Project for /e/

this post is editable as a Wiki. (1) install the appropriate Flashing Tools (2) allow “Non Vendor OS” to be installed on the device (2) Check the communication between the PC and your smartphone (5) Download a custom recovery manager (4) Download an /e/OS build (6) Unlock the Bootloader (7) Flash a custom recovery manager on your device (8) install /e/ from your computer, using the “adb sideload” method or (9) Install /e/ without computer using the “Device-Storage” method (10) post …