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I have to agree with @makiadi61 on this. Security patch level is to far behind. There have been multiple high severity and critical security patches since April 2017, source: https://source.android.com/security/bulletin/ (you can use side menu to view by year / month). Not having a go or anything 
google translate (be warned):
Google Übersetzer (sei gewarnt):
Dem muss ich @makiadi61 zustimmen. Sicherheits-Patch-Ebene ist weit zurück. Seit April 2017 gibt es mehrere hochgradige und kritische Sicherheitspatches, Quelle: https://source.android.com/security/bulletin/ (Sie können das Seitenmenü für die Anzeige nach Jahr / Monat verwenden). Nicht gehen oder irgendetwas
Yes, i get new info. With future updates are all security patches included. This means the updates will be much bigger then usual.
With next update comes all actual security patches and with future updates the patches will be updated each time (if available).
In update from this week (24.04) are the security patches not included.
S-Series Security level will be updated early July.
Z-Series will be updated in August.
