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These efforts todate have gone unanswered, with no reseller willing to get it done.

It is relevant, because from a live system, you can tell what SoM the unit is using Also, Shenzhen Joyous (which was a manufacturerseller) does not currently make any PX3 or PX5, let alone any Intel units.

Also, HCT does make a variety of SoMs, but they certainly dont make all of them.

You can tell that the RK3368PX5 units sold by Joying are not MTCDE just by looking a the interface, no need for any kernel checking.

You also misunderstood what I said about SoMs, - I said that HCT make all MTC SoMs I did not say that HCT made all SoMs for all headunits.

FYI. JY-UM135N2PXC,JY-UM135N2PX5R,JY-UM135N2PX5,JY-VM131N2PX5C,JY-VM131N2PX5R,JY-UMS04N2PX5,JY-TM139N2PX5 are STT based units from Joying.

Well as there is no Android 8 image available I decided to check if I can create a recoveryupgrade-disk using available Android 6 tools.

After this I inserted the card to the GPS slot and fired up the head unit.

Well, after the flash completed it was booting to recovery only.

But from there I could also re-apply update.img to get a fully working system again.

I was brave enough then to try replacing the stock recovery.img with some RK3368 TWRP images I found online.

I guess it would require some PX5 adaptations to get it working.

So I am still quite convinced that we could manage flashing PX5 Android 8 images using those tools.

But I am quite sure some of you did the same already playing with your units.

Did anyone here try already use and verify the tools linked in initial post I just started some tests.

Rockchip Recovery Tool