Export impor customers from 1.5 to 1.6

[st0le]

Hello,

I have 2 prestashop one with 1.5 and other with 1.6.

 

I need to move just the customers to my 1.6 because the can't login already.

 

I was thinking to update the 1.5 to 1.6 and take the customers just for the data base..

Anyone know how can I do it? 
 

Thanks