You can download ADB
http://adbshell.com/downloads (ADB Kits) and connect to the box, and list the packages installed (replace DEVICE_IP with yor device's IP address):
adb connect DEVICE_IP:5555
adb root
adb remount
adb shell pm list packages -fNow you can look for the unwanted package(s).
You will see lines like this:
package:/system/etc/facebook.apk=com.facebook.katana
In which this is the package location:
/system/etc/facebook.apk
And this is the package name:
com.facebook.katana
You can backup the package for your PC like this:
adb pull /system/etc/facebook.apkAnd you can remove the package like this:
adb shell rm /system/etc/facebook.apk
adb uninstall com.facebook.katanaIf you are not careful and delete something important you may break your device and you may need to reinstall it. That's why I recommend to back up the packages before deleting them.