For those of you with the older PX3 board and pathetic 1GB RAM on Android 5.1, here is the board upgrade that gave my Eonon GA6166 a much more healthy 4GB RAM and Android 6.0
It is offered by several Ali sellers:
https://www.aliexpress.com/item/Octa...ffae3c00SRyEfH
https://www.aliexpress.com/item/4GB-...45513c00B5aOnZ
This upgrade saved me from having to pull another dreaded FAKRA cable from under the spare all the way up to the front Nav head area and purchasing a new unit with greater performance.
The 1GB board without a modified ROM from a talented developer at XDA Developers forum was awful. RAM is like HP in these machines, too much is just enough!
Mike