Dekko problem following OTA update in Dec 2016

Hi,

On a MEIZU PRO 5 with latest OTA in Dec. 2016, find a new option to have, when offline, the possibility to read emails in Dekko.
Option that was not offered before that update, when offline / off any data connection, it was not possible to read the emails in Dekko because as soon as you started DEKKO, if the connection was not available, the app closed straight.

Therefore I found interesting to be able to read my emails offline and I tagged the option.

Since that time, I cannot anymore open Dekko, offline or not.
I don't have enough time to tip the parameters menu and even if I manage to, the app closes straight.

I tried to uninstall that app and reinstall it but the parameters are not removed when uninstalling. Therefore, reinstalling does not solve the problem.

Thanks in advance for your help.

Regards.

P.S. : would be great to offer the possibility to remove an update instead of leaving users with a disable toy...

Court résumé en Français :
Dekko avant la MAJ OTA de dec 2016 n'offrait pas la possibilité de lire ses mails hors connection data.
J'ai donc coché l'option, en soi intéressante.
Depuis, dès que je lance DEKKO, l'appli ne s'ouvre plus, qu'une connexion data soit active ou pas.
Et lorsqu'on réussit à cliquer sur paramètres de DEKKO subrepticement, cela ne produit rien et l'appli se referme quand même.
Une désinstallation/ ré-installation ne produit aucun effet notable, les paramètres subsistant après la désinstallation.