C350 hungs in call

[naahou2000]

I have a motorola C350 that hungs in outgoing call or ingoing call, i flashed it with victor cracked with : c350_g_09.04.26r_lang0004_full_flash and flexed it with : c350_europe_and_asia_manufacturing_flex_gm6l0e10a7 , after that there is no network, i did the full factory reset, i activate the band 900/1800 mhz by opcode but always no network. please what i must do ?
the original flash is : R312ULSHA_G09_10_29R
the original flex is : SE7648 AXXT1079

thanks for your help