How to Install Custom ROM through Recovery:

1)Through TWRP Recovery:

Copy your rom.zip(the ROM file that you have downloaded and want to install) on external sd card/internal SD card

**Install  twrp recovery through mobile uncle tool(If already installed,leave this step)

 **Reboot into recovery(press and hold Volume up +power button)

Taking Backup of current ROM:

  **Backup->check system,data,boot,recovery,cache,uboot and nvram ->swipe right to backup

(If you don't want to take backup of your current ROM,leave this step)

 Wiping:

  **Select wipe

  **Select Cache->swipe right to wipe

  **Select Dalvik cache ->swipe right to wipe

  **Select Factory Reset->swipe right to wipe

  **Select System->swipe right to wipe

  **Select Install

 Flashing ROM:

  **Scroll up/down and select the desired rom.zip to install->swipe right to install

  **Reboot-> system

2)Through CWM:

Copy your rom.zip(the ROM file that you have downloaded and want to install) on external SD card/internal SD card

 **Install a custom recovery through mobile uncle tool(CWM)(If already installed,leave this step)

 **On your phone the USB debugging option must be enabled: “Settings -> Developer  Options -> USB debugging->on”.

 **reboot your phone into recovery mode(press and hold Volume up +power button)

 **Backup  first

 **After backup complete select  “wipe data factory reset”

 **Select  “wipe cache partition”

 **Select  advanced menu and do “wipe dalvick cache”

 **return to recovery main menu

 **choose zip from SD card

 **choose  the update file and flash the same

 **Done