Download Android Jelly Bean 4.2.2 stock firmware for Star A2800 / Kingelon A2800 / OrientPhone A2800 smartphones from here or from here.
Archive name: A2800 / 20140422_e2719_v92_jbla878
Archive file size: 696 MB
Model: Star A2800 / Kingelon A2800 / OrientPhone A2800 smartphones
Project: ve2719_v92_jbla878
Platform: Mediatek MT6592
Config_version: V1.1.2
Baseband: MT6592_S00_MOLY_WR8_W1315_MD_WG_MP_V21_P1_1_wg_n
Upgrading notes (see this video tutorial)
1 – Download & unpack FlashTools. Run Flash_tool.exe
2 – Unpack Rom in folder
3 – Select MT6592_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 !