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custom roms - format data before or after flash?

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Reading the XDA forums I've noticed some posts around custom ROM flashing instruct users to perform data format in a recovery (such as TWRP) at different times. My question is - should data format be performed prior to flashing the ROM image, or right after it? Does it even matter?
Asked by basher (33 rep)
Dec 31, 2023, 01:04 AM