Ifwi version is M882_JJ.015. Dual boot it as in Linux? Or windows? I am not sure about bit system. I have read many Intel based tablets can be modified with correct Intel firmware software. I have root so umm i just looked audio subsystem up with mixplorer. It's Realtek5651.
Ubuntu on this device is pretty much broken. Touchsceeen doesn't work and is super slow. I wasn't able to run any other distro. If you still would like to boot into Ubuntu anyway and play around with the system, lookup "Linuxium isorespin.sh intel atom". I never tried windows, probably even worse I would imagine.
You can try debloating your system with Link2SD. It's a powerful app and can easily brick your device so make a backup first and research what the app does before you disable it and you should be good. Went from about 30 apps to 10 apps and noticed some improvement. Note that you only have 1 gig of RAM so you'll have to keep yourself from having too many processes running. In developer settings all the way down, you can configure apps to never run in background.
I know all about removing apps and limiting background apps. I even limited the processor to 1.44ghz so it wouldn't overheat and turn the screen brightness down. I mean it seems like your saying even then you have issues. It's a shame I have a Asus a1-850 running an Intel processor with 1gb of ram and it doesn't show down like this. It's even one generation earlier processor. It isn't running a 64 bit os though, never checked this one. I guess Nextbook os was build shotty. I have also had a Windows in tablet that only had 1gb it's team on the same older processor. It ran fine but had several limited application selection that would run on it. I assume this had got efi then since you got Linux to run. That's neat but pointless if it runs poorly. Guess I should have guessed Android 5.1+ -6.0 had issues even on arm. My s5 note 3 and note all had issues with it. Here I was hoping for a cheap decent tv box.
Hmm I might actually try to run windows 10 and see how it goes
Update: With otg cable + keyboard, I booted into UEFI by pressing Escape, then Boot Selection, selected the micro sd card and booted straight to blue screen with error saying not enough memory. I don't have the 32 bit version .iso of windows 10 and my internet is super slow right now. Looks promising though
In UEFI there are some settings related to thermal stuff so maybe that could help but be highly cautious of changing anything. I had another nextbook, the only difference is it has a Everest audio chipset, changed one setting in UEFI and boom, complete brick now.
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