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Mi Pad is still KK. AFAIK There is no Android L build by now.
Further the repartitioning and Upgrade to Android L are completely independent! There is no need to repartition Mi-Pad.
Xiaomi only did that for the Mi2.
Thank you... In other words: I can simply upgrade my current MIUI with the current sMIUI using TWRP, correct? (as both are KK). I guess I can even use AROMA...