[Android Head-Units] kesril:
I'd like to thank @lukinha and @agmtpd for their posts/comments about Zlink and their experiences. I got an android head unit recently and I really couldn't find clear information of zlink or the updating process. This is just a simple guide for anyone with a similar android head unit and what worked for me.

WARNING: PROCEED AT YOUR OWN RISK. NEITHER I NOR XDA SHALL BE RESPONSIBLE FOR ERRORS IN THE USE OR BRICK OF DEVICES.

***READ THE WHOLE GUIDE BEFORE ATTEMPTING***

Steps:

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1. Check what version of Zlink you have:

Go to in the ZLink app settings on the bottom right

Press "DEVICE INFO" then on the line "PLATFORM" take a picture of what it says

Mine was "ZHANGXUN-YT9216CJ"

The "YT9216CJ" is what you should pay attention to as that relates to the 92XX update file

***This Guide is based on the 92XX type of platforms, I'm not sure if other numbers or variants work so proceed with caution if yours is different***

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2. Download update from XYAUTO

xyauto is the only place i know of that supplies these updates and their website can be difficult to navigate. I highly recommend the google translate extension on chrome or any other translation tool.

xyauto login is: username: xyauto | pw: 123456

On xyauto, press "92系列通刷工具包" then "手机互联" then keep navigating thru the Zlink folders until you get to the file.

If you have a translate tool, the first line roughly translates to "92 Series Brushing Tool Kit" and the next translates to "Mobile Internet". If these have changed since posting this, try to navigate as close as possible to what it is here.

Also as of posting this, just pressing the top folder until you reach the file works for me but I would translate it just to be careful.

Download the .tar.gz file that shows up there, I'll attach the latest file as of right now just in case future files aren't functional.

"gongban_92_zlink_5.4.33-v8.0.1_e5c2e04f_ota.tar"

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3. Getting the USB ready

***Disclaimer: Formatting is required so use a USB that doesn't have information or back it up***

Get a USB over 50mb in capacity and format it to fat32

On windows you can select "quick format" and select fat32

Move the "gongban_92_zlink_5.4.33-v8.0.1_e5c2e04f_ota.tar" file into the USB.

MAKE SURE NO OTHER FILES ARE IN THE USB JUST THE .TAR FILE

"Eject" USB on windows just to be safe

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4. Flashing the file to the head unit

Make sure you have either the 4-pin or 6-pin usb plug attached to the back of your head unit.

Turn on the head unit and plug in the USB

Navigate to Settings then to "System Information" and press "Android upgrade"

If the option is greyed out, check your USB connections and the USB itself

Follow the steps on screen and don't unplug the USB until the headunit boots up again.

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DONE (notes)

Test out Zlink and see if it works as intended.

Some settings might get reverted back to factory

Double check Step 1 again to make sure the version is "5.4.33" or whatever version you installed.

Hopefully this guide provides a clearer way of updating Zlink! My Zlink before worked ok and I mainly use the USB connection as my way of doing CarPlay but the (Navigation Bar/Navbar/Status Bar) kept showing and wouldn't hide with the hide button. The update fixed the issue with it fullscreen now and so far I haven't encountered anything other drastic issue yet.

If you do get bricked somehow, I can't help you much but this post by @ExtremeMOD might be able to get you in the right direction

Also this website is a good resource I'd highly recommend looking around it if you have questions regarding overall functionality and possibilities with these android head units.

If this guide can't help you, try @lukinha post here. S/O to him and everyone else who provided help through the replies.