If you are looking for a "Rkpx3 Android Update," you are likely looking for a rather than a new version of Android.
The biggest problem with staying on Android 4.x today is app support. Rkpx3 Android Update
A prompt should appear asking if you want to install the package. Tap If you are looking for a "Rkpx3 Android
If OTA is unavailable, you’ll need a PC, a USB A-to-A cable, and the . Follow this guide carefully. you’ll need a PC
: These units often use "modded" or unofficial firmware. Attempting an update with the wrong file can permanently brick the head unit.