Use APKPure App
Get ID ANDROID DEVICE-Backup root old version APK for Android
You can see your ID ANDROID DEVICE for AdMob and more applications.
You can see your ID ANDROID DEVICE and create backup for then comparate.This application can be installed manually into the system to keep after reset.you can support your id only the first time , if you uninstall able to create the backup but will register the same id