Customers using V.12 of the application can upgrade from Lydia+ to Lydia Black+, effective immediately, from the "Lydia versions" section in the "Account" tab by tapping "Change Lydia version".
Customers using V.13 of the application can no longer upgrade to Lydia Black+ but they can subscribe to the black card offered by Sumeria, from the "Sumeria offers" screen, accessible from the "Profile and settings" screen.