Download Android 4.4.2 Kitkat stock firmware for Umi Zero smartphone

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1. Download Android 4.4.2 Kitkat stock OTA firmware for Umi Zero smartphone from here or from here.(flashable from Recovery via SD Card)

Archive name: Umi ZERO FW / Y800_UMI_20141101_2258_OTA FW
Archive file size: 374 MB
Update image file: Y800_UMI_20141101_2258_OTA.zip
Project: ratech92_cwet_rlk_kk

Build number: ratech92_cwet_rlk_kk-user 4.4.2 KOT49H eng.liujia.1414847742 test-keys

2. Download Android 4.4.2 Kitkat stock firmware for Umi Zero smartphone from here or from here.  (flashable from Windows PC via USB cable)

Archive name: Y800_UMI_20141104_1907
Archive file size: 391 MB
Project: ratech92_cwet_rlk_kk 
Platform: MT6592

config_version: V1.1.2

Upgrading notes (see this video tutorial)
1 – Download & unpack FlashTools. Run Flash_tool.exe
2 – Unpack Rom in folder
3 – Select MT6582_Android_scatter.txt in folder on rom. And wait.
4 – Check Option->USB Model, click USB Model
     Choose Option->DA DownLoad All->Speed->High Speed, click High Speed
5 – Turn off your phone, remove the battery.
6 -"Press F9 (or hit Download button)"
7 – Connect your phone into the computer with USB data cable.
8 – The process will start and a red progress bar will appear after color purple, yellow.
9 – And green circles display.
10 – Boot your phone
11 – Restart
12 – Enjoy    

Changelog
1. Fix bugs
2. Update stand-by time
3. Add ROOT permission.(control by APK)
4. Add four functions for unlock interfacE
5. Add one functions for facial recognition to unlock the phone
6. Add reboot system function
7. Camera optimization
8. Extreme power saving mode
9. Add torch function, you can find it in pull-down menu