Ok, took me some research to create a keystore on the device, as it sees the in-app version is broken, with no fix in the near future, and the other method I informed in here, through a website, is deemed quite unsafe, and the keytool on terminal doesn’t generate an acceptable version of the keystore.
So there is an app which allows to install a graphic linux on your device, called Userland, WITHOUT ROOT! Once I installed LXDE, I opened a terminal, updated everything and installed java (google tuts are great). Then installed a program called KSE (https://keystore-explorer.org/), which allows to create keystore. I created one with all basic info, just adding an alias, my name and password, and finally got a safe version of the keystore. Then copied it to android (copy it to /storage/internal) and managed to compile a release version of my app.
Found a way on device
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