How to flash official ROM zip?

My friend's device has TWRP 2.8.7.7 and CyanogenMod 12.1 by @ED300 (not up to date).

She wants it to be restored in its original state. How could I flash this file?

Code:

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http://ift.tt/1Xfd02Q

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Should I just wipe system, data, and cache in TWRP then flash the zip from the link?

from xda-developers http://ift.tt/1SY3SdZ
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