If I can see well, that phone should be identical with Intex Aqua I4+
So, to unlock - simply reflash With Intex ROM :
Intex_Aqua_i4_Plus_V14_Indian_SER
Of course, make full phone backup, NVRAM backup,
and skip preloader flashing (like with all unknown roms).
test and post results.
b.r.
Alex