Miui 12.5 to miui 13 July 8, 2019 16 32 64 128 Miui 12.5 miui 13 Miui 12.5 vs miui 13 Miui 12.5 vs miui 13 performance Miui 12.5 vs miui 13 reddit Miui 12.5 update to miui 13 Miui 13 12.5 Miui 13 to miui 12 Miui 12.5.5 vs miui 13