I'm not really sure what the latest Android version will add to be honest. Its just a music player at the end of the day. I switch it on, load up UAPP or the stock music app, listen to music and switch it off. 

You can't blame them.
Many phone models will state that they will support one Android version update. Moto phones "guarantee" an amazing 2 Android version updates!
After that, the development teams move on to new models, they can't keep dedicating man hours to obsolete tech.
The 300r came out ~4 years ago, and is no longer in production.
We can't really expect Pioneer to put a team together to adapt Pie for a product they no longer sell.
If you got the chops, you could root the 300r and see if you can upgrade to Pie without disaster...
I switch it on, load up UAPP or the stock music app, listen to music and switch it off.![]()
Steve -- can you explain what the advantages of using UAPP are if you are not outputting audio via the micro-usb port? I've used UAPP extensively with my Samsung tablet and think it's a terrific app. But I do output via the usb port with link to a Dragonfly Red in that case. If I'm listening to the 300R through the balanced output, does UAPP help?
Just so I'm clear, you're using UAPP and still outputting through the 2.5/3.5mm jack, not the micro-usb, yes?
Steve -- I don't want to stir controversy ('cause I know it's very controversial in some circles) -- but what do you think of MQA? I have the MQA plug-in as well with UAPP. Can I hear the difference between MQA/"Master" and mere "Hi-Fi" on Tidal? Very doubtful.
It will work so long as there is no imbalances in sound loudness in either left or right channel. Sound stage improves and bass tightness increases.As along as UAPP is available for android 5.1.1, for me it is enough.
The one thing i didn't tried is balanced mode, i couldn't find a balanced cable for my headphones. There are plenty available online but without testing them it's hard to decide. i should eventually purchase one and hope it's improving the sound.
It will work so long as there is no imbalances in sound loudness in either left or right channel. Sound stage improves and bass tightness increases.
That’s been the problem with every adapter I’ve tried the left side is always louder than the right side through balanced. already cross tested it with a 4 pin xlr amp and single ended and both have an even left and right channel balanced with normal songs.
My final adapter (and most reputable, pricy, etc) is showing up in a few days.That's strange, it may be an issue with your player. I've certainly never noticed a channel imbalance with mine.
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Finished ROM cooking with some fixes today. It took a long while to make flashing ROM update file that can be installed like Onkyo DP-X1. However, setting up driver that needs power user skills to install un-identified driver manually and USB debugging with OEM unlock.
Do you guys think I should publish this? I feel the responsible would be too great and even person who ported TWRP got comments about bricking reports.
Regards,
Keetakawee