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Does flashing a xiaomi (redmi note 5 AI) phone with a global/ chinese ROM clear/ wipe the device memory (like pictures, music & text) and existing user apps data (considering there is NO memory card in the mobile phone) ?
If your device is China variant, to flash global rom you need unlock BL and keep it always unlocked. If by mistake you locked BL device will brick.
Flashing will wipe everything except when you upgrade via Ota