No way I can do this as my old phone was bricked. Already sent in to Samsung to change the motherboard.
NDrive just replied me via Twitter (out of desperation I tweeted them) that there is NO WAY to transfer as their maps are tied to IMEI. What this also means is that your map can only be used on ONE phone. Once you change phone, that's it. You pay to buy the same map again. I am totally pissed now!!! What kinda of stupid licence is this.
Sony Xperia Z2
Dopod 838 Pro -> Asus P750 -> HTC Touch Pro -> HTC Touch Pro2 -> Samsung Galaxy S -> Samsung Galaxy SII -> Asus Padfone -> Samsung Galaxy Note II LTE -> Sony Xperia Z2