The keys are located in: build / target / product / security:

[sgs01115]

https://devarea.com/signing-android-application/#.XmD1xErgr95

Currently, we are creating a system application that runs by i.MX 8M Miniin android studio. I think that "Signing Application with the Platform Keys" of the above site is necessary.

However,

The keys are located in: build / target / product / security:
platform.pk8
platform.x509.pem

We don't know in which environment the directory is located. Anyone, any suggestions?

[Bio_TICFSL]

Hello Sachio,

You need create this variables If they aren´t. The Android BSP is customizing for i.MX8 if you need more security things you are going need to ask professional services:

Professional Engineering Services | NXP 

Regards