Okay Ill take Android 10 lol. Is the 430 sdk locked down, akin to what fiio is dealing with on the exynos chip they prefer? Or is it some other google licensing issue?
It is up to Qualcomm to update the SDK to be compatible with newer version of Android.
But since SD430 is an entry level SoC from 2015 , manufactured in a 28-nm process , don't expect Qualcomm to maintain and update a "low budget" SoC that long ...
That's not how the market works.
Qualcomm makes money by selling SoC , not throught software update ...
There are Snapdragon 430 phones on Android 9
You have the list here : https://www.notebookcheck.net/Qualcomm-Snapdragon-430-SoC-Benchmarks-and-Specs.185278.0.html.
From what i saw and check (a few Huawei , Lenovo ...) , they are all stuck to their out-of-the-box Android version (7/8).
The only one running Android 9 is the Nokia 6 (first gen) , not even Sony update his Xperia R1 to Android 9.
I read somewhere that Shanling cancelled / postponed Android 9 on M6 / M6 Pro , but i'm not sure as i don't find where i saw that.
Anyway , if Shanling didn't update their devices to Android 9 , and Nokia did , i guess Qualcomm didn't update the SD430 SDK , which means Nokia update his device all by themselves.
It's the only explanation i can think of , because it wouldn't make sense that Qualcomm update the 430 SDK and Shanling didn't use this opportunity to update their devices.
... Except if this update bring problems (compatibility / stability / speed / heat ... ) ,but that's another story ...