The Android 6.0 Marshmallow Update – software version:v20a for LG G4 Beat H735 is available for download from LG Mobile Support Tool.
The update is so far available only in Turkey. LG G4 Beat (aka LG G4S) owners in other country or area should receive the Android 6.0 Update in a few days.
How to Update LG G4 Beat or LG G4S to Android 6.0:
Download and install the LG Mobile Support Tool.
Launch the LG Tool
Connect Your Phone to PC via USB Cable
LG Tool should notify you that there is a new update.
and then follow the on screen instructions to upgrade your phone.
Or You can download the LG G4 Beat H735 Stock Android 6.0 firmware – KDZ File from LG Server.
Here is the download link: H735TR20a_00_0224.kdz
The source code of LG G4 Beat H735’s V20a firmware is also available now on LG Open source code website.
Source: LG Open Source