[YotaPhone] TheArt.:
The stable Android Marshmallow 6.0.1 - firmware 1.1.47 update is officially being released Over-The-Air (OTA) starting from 29 March 2017 in the afternoon, here is the announce on the YotaPhone VK page.

Moreover, the main improvements are listed in this official 4pda post by the company YotaDevices. Main changelog can be found in the attachments, but many other new features are explained in the YotaHelp app within MM.

The update will initially arrive by OTA to those with latest RU 134 firmware, later it should be available also on the FTP YotaDevices' server. In the future it will be pushed also to EU firmwares. Keep in mind that for a succesful OTA installation, the phone must be stock, with no /system partition modifications and stock recovery. Root will be lost after the update. As this is a major update, as for every Android phone a clean start is recommended (factory reset). It is not necessary, by the way, things can work fluently even without it.

Found a bug? The company YotaDevices explicitly asked to kindly send them your findings if you wish to help, let's see how.

Find out if the bug is reproducible and notice what are the phone's settings and configuration to make this bug happen;

A useful app for bug reports is this one;

Provide as much detail as you can, with your phone specifications, firmware, version, etc;

To generate bug reports, also the command adb bugreport bugreport.zip can be used while the device is attached to PC with ADB enabled;

If you can't handle native bug report funcion, just provide as much information as you can, maybe with some screenshots;

Send everything to support@yotadevices.com

​

As it is taking a lot of time to update due to many requests handled by their servers, unkernet uploaded the MM update 147. I will attach .torrent files in this post, one is FULL FOTA and another one is OTA from RU 134 to MM. Here there is another mirror for FULL FOTA: GDrive. These files can be pushed manually into the phone (sideloaded) with adb using stock/TWRP recovery (even if sometimes there are errors with custom recoveries such as TWRP). This procedure brings to identical results as an OTA has been installed automatically. Just go into recovery (VOL UP + POWER), select apply update from ADB, connect the phone to PC and with a command prompt opened where adb.exe and the FOTA.zip are located, type: adb devices, which should return a value, then adb sideload FOTA.zip.

How to adb sideload an update (no data loss)​

[MENTION=7359957]hpnhannghia[/MENTION] created a video-guide to update to latest MM build starting from latest RU Lollipop 134, using adb sideload. If you find it useful, you may thank him in this post.

BETA-PROGRAM DETAILS ARE HIDED IN THE SPOILER BELOW, AS THEY ARE NO LONGER RELEVANT.​

UPDATE 20/12/16: BETA-TESTING APPLICATIONS ARE NO LONGER ACCEPTED.

As of now the LATEST OFFICIAL MM BETA is 1.1.31. Download links and instructions are in the OP. The 1.1.43 is leaked and YotaDevices said that it is UNSTABLE.​

The beta-testing program for Android Marshmallow has begun! The announcement was made officialy by the user YotaDevices on 4pda.ru.

First of all I would like to thank the user [MENTION=384111]Amplificator[/MENTION] who pointed it out here

I will translate and put the announcement below in the spoiler:

Dear friends!

On the eve of one of the most magical and wonderful festivities, our team wants to offer YotaPhone 2 users to participate in the beta testing of a new firmware for the transition to Android 6.0 (Marshmallow) operating system.

You will be able to experience Android 6.0 in action with several new features, and in return we ask you to share with us your comments and suggestions. As part of the beta test on YotaPhone 2 will be sent to upgrade to Android M. But before you decide to participate, please read the instructions below.

The updates that you receive as part of the beta version, may contain errors or defects that significantly affect the operation of the device.

You can always choose from and return to stable public version of the firmware running Android 5.0 Lollipop. However, if your smartphone has already installed a beta version of Android M, then during the rollback, all user data will be deleted permanently.

Participation in the beta available to users who bought YotaPhone 2 on the territory of Russia (in the online shop or at official points). Smartphones currently RU1.1.134 firmware version must be installed.

The beta-version of the firmware on China Yotaphone2 (Model YD206) could be installed incorrectly or with errors. In this case, we are not responsible for the performance of the whole system, so we do not recommend to the users of this model to participate in the test program.

In order to examine your applications to partecipate to the program we need the following information:

IMEI ( "Settings" -> "About phone" -> "General" -> IMEI);

A screenshot of the settings in the "About phone", namely the points "firmware communication module," "kernel version" "Build Number";

Contact information (name, email address, phone number).

Please send the info above with a personal message to the representative of YD 4PDA: YotaDevices

__________end of announcement __________
​

SENDING FEEDBACK TO YOTA-DEVICES:

If you have found a bug that just happened or you can even reproduce it, you can send bug reports here: TechCS@yotadevices.com with the function "send bug report" which can be found the Developers option in the Settings. You have to click that function no more than 15minutes as a bug has occurred, and in the email specify as better as possible what you've done to reproduce it, and write your IMEI. [Before sending reports, a

clean

installation of the latest beta is advised, that is, flashing the latest FOTA and then doing data/dalvik/cache wipes.]

For general support and feature request any YotaPhone user can write to: support@yotadevices.com

UPDATE 23/12/16: FOTA OF LATEST BETA VERSION 1.1.28, TO BE INSTALLED STARTING FROM 5.0 RU .134: need to be sideloaded (adb sideload filename.zip) using stock recovery. Download here.

Credits to 4pda user kosvas

UPDATE 25/12/16: TWRP BACKUP OF BETA 6.0.1 firmware 1.1.28: Download link. Unzip it and put the folder into your personal TWRP backup folder, which name is alfanumeric (for example: 025e8b1302684091f). You can find it in your phone: TWRP/BACKUPS/*******. You already have this folder if you created a backup with TWRP in the past. If not, just enter TWRP and create a small backup (of just one partition for example), thus TWRP will create the folder you need. Inside this alfanumeric folder you will put the downloaded file.

Source and credits this 4pda post.

UPDATE 29/12/16: TWRP BACKUP OF BETA 6.0.1 firmware 1.1.30: Download link see instruction above. Source and credits this 4pda post.

Moreover, here there's the OTA 1.1.30 with must be applied from 1.1.28 with stock recovery using adb sideload (you must be unrooted). For your convenience there's also a full FOTA Marshmallow 1.1.28 here which must be used from latest 4.x RU Android version. Source and credits this 4pda post.

UPDATE 10/01/17: FULL ZIP OF BETA 1.1.31: It has to be installed on stock ROM without modifications, using the stock recovery and adb sideload command. link here: FOTA MM. Source: 4pda post The incremental update (from 1.1.30 to 1.1.31) has not been uploaded by anyone, at the moment.

You can use any method you want between these two:

adb sideloading

the official FOTA with stock recovery OR

restoring a clean TWRP backup

created by beta-testers.

UPDATE 03/03/17: OTA ZIP of LEAKED 1.1.43: This OTA package has been received by mistake by one of 4pda user, Kazus48; YotaDevices replied saying that

this version won't be available to beta-testers due to its instability

. Nevertheless, it has been extracted and uploaded by welser. I repeat that installing this OTA is not advised by YotaDevices, do it at your own risk, as it is an internal build. You can find it here: sideload it with stock recovery above 134 Lollipop.

When the beta-program will end the official marshmallow release will be available initially by OTA to any YotaPhone2 with latest RU and EU firmware (no matter which radio or which model (YD201 or YD206).

Take a look at this post to have a brief review of the MM update and to see also some screenshots.

Step-by-step procedure to install a TWRP backup file linked in the OP: Post#113

Complementary information: All-in-One Guide for YotaPhone 2 where every modification to the phone is explained and every aspects covered, a MUST-READ before asking questions: YotaPhone 2 Info