May be it is better for you to get help from someone who is familiar with flashing ROMs on Android devices.
There is a ROM flashing tutorial on this forum using SP flash tool.
You can get ROMs for your device from:
1. http://bbs.ejiayu.com (Chinese official forum for Jiayu)
2. http://www.needrom.com
3. LeWa ROM for your device may be available at Phones section of this forum.
Good luck!
Try to install a suitable ROM with play store.
New development version:13.08.30
LeWa_HUAWEI_C8813_JB_ROM_13.08.30
New development version:13.08.30
LeWa_HUAWEI_C8812_ROM_13.08.30
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LeWa_TCL_S950_JB2_ROM_13.08.30
New development version:13.08.30
LeWa_KTOUCH_U86_JB_ROM_13.08.30
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LeWa_LA_M1_JB_ROM_13.08.30
New development version:13.08.30
LeWa_AMOI_N828_JB2_ROM_13.08.30
New development version:13.08.30
LeWa_AMOI_N820_JB_ROM_13.08.30
New development version:13.08.30
LeWa_AMOI_N821_JB_ROM_13.08.30
New development version:13.08.30
LeWa_Jiayu_G4_JB2_ROM_13.08.30
New development version:13.08.30
LeWa_Jiayu_G3_JB_ROM_13.08.30
New development version:13.08.30
LeWa_Jiayu_G2S_JB_ROM_13.08.30
New development version:13.08.30
LeWa_Jiayu_G2L_JB_ROM_13.08.30
New development version:13.08.30
LeWa_Jiayu_G2H_JB_ROM_13.08.30