My Nexus 5 bootlooping and 0mb internal memory.

I friends my Nexus 5 is bootlooping and it is showing 0mb internal memory in twrp.how to fix it plz help me.i have tried with installing different ROMs but it shows to mount the storage .same in adb fastboot it can't install.plz help me my email address:bhuvan.rvs1015@gmail.com
:confused::crying:

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