Hello all sailors ,
As htaeubert said here : [release notes] Koli 4.0.1?
my XA2 uses always the Android 8.1 version 
How to upgrade to version 9 ?
Thanks a lot
How do you conclude that? And how come “always”? It does not change.
Consider installing Aida64 app from an Android store (e.g. m.apkpure.com) .
Open this app and visit the Android page in it. You should get:
“Android Version 9 (Pie)” and “API Level 28”.
Android 9 is installed by the OS update, automatically.
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My XA2 is under Koli but for android it’s always 8.1
I’m not a computer developer and i’m just a user (but an user since the begining)
Well, you did not do exactly what I asked you to, i.e. you did not install AIDA64 from an “Android store”. 
Namely, only the Android version of AIDA64 can show what Android app level the Android App Support of Sailfish corresponds to, and it is now “9/Pie” on XA2. The Sailfish Aida64 app (your screenshot is from that app) does not know the internals of Android App Support - it says “8.1.0/Oreo” based on the Sony vendor image (e.g. “SW_binaries_for_Xperia_Android_8.1.6.4_r1_v16_nile.img”) on which the Android App Support was built.
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@jovirkku I did wonder this, too. Thanks for the tip. Now I have two Aida64 applications side by side.
In my case, i delete before the AIDA64 provided by the Jolla Store
(and i win a little place in datas-system)