Sony Mobile company release beta program Sony's Android™ Concept few days back for 500 selected users Sony XPERIA Z3. Thanks to one of my friends now i am able to provide not only review of this ROM, but also download link. So everybody can try something like AOSP with Sony applications. You doesn't need unlocked bootloader or root, just download provided FTF file and flash it with Androxyde Flashtool.

How to install Sony's Android™ Concept ROM for Sony XPERIA Z3
1. make backup of your data (you will lose all of them)
2. download and install latest Flashtool from this article
3. download also Sony's Android™ Concept ROM for XPERIA Z3 (Google Drive or Mega)
4. paste the ftf file downloaded in step 2 to folder „Firmware“ included in the XPERIA Flashtool
5. open the XPERIA Flashtool, click on flash and choose downloaded firmware, than click ok
6. turn off your phone and when Flashtool shows pop up window, connect phone to PC with holding volume down button
7. after few minutes all is done and your phone gets Sony's Android™ Concept ROM


My review of Sony's Android™ Concept ROM for Sony XPERIA Z3

- ROM is very fast and stable
- it is something like AOSP with some Sony applications
- there isn't Stamina mode, Screen Recording, XPERIA themes
- but there is Music, Album or Whatś New - ROM is based on Android 5.1.1 Lollipop
- if you know AOSP, than this is not so interesting for you
- most of application in app drawer are from Google
- you can change icon size, it it similar to stock Android 5.1.1 from Sony Mobile

How you like it? You can discuss here on XDA

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