Here is how to upgrade your Yotaphone2 (model yd206) from stock Android 4.4.3 KitKat to 5.0 Lollipop.
This will improve performance and you’ll enjoy enhaced e-ink apps.
The internal phone name is YD206 but after upgrade it will be labeled as being model YD201 which does not have any effect.
To perform the upgrade, you’ll need a Windows PC, the USB cable for the phone and some patience. Your phone needs to be fully recharged.
Start with getting « developer mode ». Under Settings->About Phone, and tap « Build number » seven (7) times.
Activate Settings->Developer Options->USB debugging. Sync your contacts and calendar one last time as we will wipe everything on the phone.
On your PC, download the Yota flasher (but no firmware yet) from the Yota FTP site. It includes the standard adb and fastboot binaries and adds Yota-specific functionality.
Install it to a location of your choice, which I will call ...\yotaflasher in the following.
Next, install the adb drivers from ...\yotaflasher\Driver\Google by right-clicking the .inf file and choosing « Install ».
Unplug the phone, power down, then long-press volume+power to boot in flash mode where the screen just shows « Downloading… » and nothing else. Connect to PC. Then open a command shell with administrator rights (in « Start » search field, type « cmd », then right-click the icon at the top and choose « Run as Admin »), and cd the ...\yotaflasher folder.
Then type those commands:
fastboot oem unlock
Note that the first commands should show your phone with some identifier.
The second one will wipe your phone, and allow flashing new firmwares. Follow the instructions on your phone.
Now pay attention:
- launch another command shell (but don’t close the first one) with administrator rights and cd to the …\yotaflasher folder.
- Use Yotaphone_flasher.exe and download this CN version : 4.4.3-S01-003-CN1.0.4zip
- Close Yotaphone_Flasher
- Open the Yotaphone_Flasher folder and copy only the Firmware\RADIO folder to your desktop.
- Use Yotaphone_flasher again and download the latest EU stock rom 5.0.0-EU1.1.124b.zip
- Open the Yotaphone_Flasher folder and replace the Firmware\RADIORADIO folder with the CN RADIO folder you’ve place on your desktop.
Reboot your phone, power down again and long-press volume+power to arrive back in « Downloading… » mode.
From the first command shell :
fastboot.exe flash -S 512M system firmware\system.img
Let it run. When done, go back the the second command shell and run Yotaphone_flasher.exe and flash your phone.
Type Y when asked. Let it run.Your phone will reboot and let it sit for 10 or so minutes.
Configure and enjoy your Yotaphone with Lollipop