[Android Head-Units] thugscorpion:
My unit (also see pictures)

Brand/Seller: Ruancheng

Store: https://nl.aliexpress.com/store/912686343?spm=a2g0o.store_pc_promotion.pcShopHead_6001949658004.0

Mainboard/Motherboard: K841

CPU/SoC: UIS8581, also known as SC9863A or Cortex-A55.

I have the same problem concerning the com.android.documentsui and the seller send me an update that fixed import but not export. Downloading and installing an external filemanager does not help (I tried like 30 of them) and installing documentsui for android 10 also did not fix the problem.

Android is poorly implemented and the Chinese won't help.

It would be great to be able to sign the update file and only update Android with a proper version, leaving root intact.

I have little knowledge of Android and it's subsystems and won't be able to fix this on my own so I would appreciate any help!

But I have flashed different firmware versions found here and on the Russian site 4PDA.to

I downloaded everything I encountered and cannot credit the persons who posted it at the moment because I can't find them anymore. I scowered the internet so bad and so long... In any case, this is NOT my work and the only thing I can be credited for is trying it out on my unit with the risk of bricking it.

Even though it did not happen to me, you could still brick your unit with these updates!

Make sure the specs are the same, use it at your own risk!

I flashed this firmware to reïnstall the complete unit:

K4811_NWD_S212851-20220928.zip (extract the folder "Update" to the root of an USB stick, leaving to folder intact and plug it in the radio via the 4 PIN USB connector, reboot and installation will start).

https://drive.google.com/file/d/1kH7FtTnRwpqo8eemsuDbLy7S9luKgopq/view?usp=drive_link

And then patch the system with this update:

K4811_OH_S217101-20231030-pip-rooted.zip (rename to update.zip, do not extract and update the system trough the "CarSettings" app on the unit).

https://drive.google.com/file/d/1-eplGMOLRk2-jTDNCPLfcJzp4zFljx3w/view?usp=drive_link

The interface/Launcher is way different then what originally came with my unit but I want to use my own launcher anyway.

Root access enables you to delete zlink5, 360 camera, default launcher, TOPPAL service and voice (which I read might be spyware) bluetooth music and any other unwanted app.

Again, I do not use these apps, that might differ from your situation.

I would like to achieve a few things if possible at all, any thoughts on this are welcome!

- Fix false information in Android

Now my unit is showing that it has 8GB of memory while it only has 6GB, this makes the system unreliable and possible unstable. I have found the trick with the Nova launcher to launch "Activity's" but none of them revealed a Features option in which I could select the real amount of memory.

- If possible update to full and functioning Android 10

I'm guessing that updating to a new version of a good implementation of Android also fixes the issue's.

Issue's I'm having is that I'm unable to import/export files from apps like in my case Torque Pro or Magisk.

An error concerning the com.android.documentsui appears and nothing happens, even with an external File Manager.

I also purchased and installed Torque Pro plugins that do not appear in the app, as if it was never installed.