Switchoff your device.Take out your memory card.Place it in some card reader.Access it on your computer and place the ROM in it.Now, place the memory card back to your device and go to recovery.Flash the ROM from memory card and you are good to go... :)
If any of u suffering from this problem then the best way is flash the older version of twrp....i stucked in the same situation my phone doesn't support sd card and mtp not working as well.......actually i was using stock firmware in my Gionee S5.1 i tried to reset it as usual but my phone stucked in bootloop means my os was totally gone but luckily my twrp stills there hence i connected my phone to the pc its connected via mtp at that time, i found that there is a new version of twrp available i flashed it and mtp stops working as i was wiped out my whole internal memory data and my phone doesn't sd card so i downloaded the previous version twrp puted it in the usb and connected with otg and flashed and mtp worked again and then flashed new rom!!!!! I hope it will help
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