Operating system partition can be wiped in order to reinstall a broken ROM installation for example, personal files will be left intact. What is the correct partition to wipe?
Partitions for OnePlus One in TWRP (excluding cache and USB OTG):

  • system
  • data
  • internal storage

You should go for advanced wipe and choose:
-DalviK/ART Cache
And don`t format:
-Internal Memory

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