Developer version update: 2014-06-27 LeWa_JIAYU_G2F_NEW_LCD_JB5_ROM_2014-06-27
Developer version update: 2014-07-04 LeWa_JIAYU_G2F_NEW_LCD_JB5_ROM_2014-07-04
Developer version update: 2014-07-11 LeWa_JIAYU_G2F_NEW_LCD_JB5_ROM_2014-07-11
I have a G2F with a Android 4.2.2 Baseband SM219_REDUCE_BP_W_V0.0.2_S1114 2013/11/14 09:58 Kernel 3.4.5 Build number G2FW-20140606-W-R-CN-V0.8.5
Is this where you ROM began?
My one has network frequency 900 / 2100 WCDMA and quad GSM which may set it apart from others.
Developer version update: 2014-09-26 LeWa_JIAYU_G2F_NEW_LCD_JB5_ROM_2014-09-26 Stable version update: 2014-10-17 LeWa_JIAYU_G2F_NEW_LCD_JB5_ROM_2014-10-17
Stable version update: 2015-05-27 LeWa_JIAYU_G2F_NEW_LCD_JB5_ROM_2015-05-27
Stable version update: 2015-06-05 LeWa_JIAYU_G2F_NEW_LCD_JB5_ROM_2015-06-05