Latest Android 6.0 Marshmallow MDB08M.Z1.2134 concept build firmware update is now rolling for Xperia Z3 and Xperia Z3 Compact users (only for those users who signed up for this testing).
Many Xperia Z3 users are reporting that first they got update notification for MRA58K.Z1.2123 build and then after reboot Android 6.0 MDB08M.Z1.2134 build update notification popped up.
Marshmallow MDB08M.Z1.2134 concept build
Marshmallow MDB08M.Z1.2134-somc Update is confirmed rolling in regions like India, Philippines, Croatia, USA (via OTA). 
Marshmallow MDB08M.Z1.2134 update changelog
- New delivery from Google
- Sony Decouple email
- NFC updates
- Minimum value of screen brightness has been lowered
- Startip stability fixes
- Album delivery 7.3.A.6.1 – Background image fix, SD Cards folder fix.
We will share the ftf file soon for manual flashing.
If you have already got this update, let us know if you are facing any issues. Drop your comments below.
Source – XDA (shared by vRS Carl, 13nikita)
Must Read :
Xperia Home 10.0.A.0.3, Keyboard 7.0.A.0.14 apps from Xperia Z3 Marshmallow Concept
Sony’s Concept for Android: Marshmallow update rolling
Sony’s Concept for Android: Marshmallow edition available for Xperia Z3 & Xperia Z3 Compact
Xperia X Concept 38.3.1.A.0.91 firmware update rolled – Brings New SONY Audio Effects Engine for MusicFX app
Xperia Z2 23.5.A.0.575 firmware update released – Root Available
Xperia Z3 Android 6.0.1 Marshmallow 23.5.A.0.575 firmware released – Root Available
Sony Marshmallow concept software MMB29X.Z1.3582 update reintroduces FM-Radio App
How to Enable Multi-Window mode on Xperia phone running Marshmallow- Xperia Z4 402SO gets Android 6.0 Marshmallow 32.1.D.0.284 firmware update from SoftBank
- Xperia Z3 Dual gets Android 6.0.1 Marshmallow 23.5.A.0.570 firmware update
View GizmoBolt Tech Blog
