SIM card not detecting and imei null after flashing recovery (intex aqua i5-not i5 HD)
It looks like ...the custom rom you have flashed doesnt had Modem binaries of your phone...
 A rom consist of many parts that operates the device the Modem binaries are responsible to operate network related operations...

You can download stock rom of your device then extract modem binary from it convert it to flashable file than flash only the modem binary in your device if that works than ok.

Else flash with your stock rom...the problem is not in ypur device ...the problem is in that custom rom binaries..

Good day..