[Android Software/Hacking General [Developers Only]] AlleyKat:
Hi Ray, well, apart from the images to use, the method should pretty much be the same, I'm quite sure. In post 10679 by omarahum on jiongtang's forum at chinadigitalcomm.com the needed files for the latest (BETA, I assume! Warning, Will Robinson!) ROM are available.

I've read somewhere that the new editions do have some improvements, like the possibility to do a factory reset - but as I don't have this device, of course I can't test it or guarantee how it works. And it is a rather new model, so it'll take time for people to gather experience and post about it.

But taking a look at the files omarahum has posted to mediafire, there is definitely some difference in the image files they use - the system.tar.bz of the 512MB model can easily be opened (and maybe even pre-flash-edited if tweaks are wanted/needed), the system.pack.img for the 256MB model cannot.

But the procedure seems clear - unpack both files, copy the "zt-update" folder from 1st file to the root folder of a (working!) microSD-card, then copy the 5 files from the "zImage" folder in 2nd file to the same ("zt-update") folder on the card. Then make sure the device has working external power, hold the right side ESC key down while turning the unit on, and follow the on-screen instructions.

At least that is how I interpret the readme:

Product: ZT-180 10inch DDR512MB +4GB tablet

The Way for upgrade and announcements
===========================================
must-see for upgrade
The file is too big to uploading,so it will be packed into two different files.

1)Unzip the two files after you download them

2)Copy all the five documents in the file named "zImage" into the file named "zt-update"

3)Copy the file named "zt-update" to TF card and then update for your pad
=========================================== Emphasis : As the firmware contains SPL program, so there are one issue which should be paid attention to
1） SPL upgrade is risky, if power cut happens in the process, the netbook has to be repaired.
Time of duration for this risk is less than 5s. so it can not be power cutted during upgrade process.
===========================================

The way for upgrade by TF card is followed as below:
1: Copy files in ZT-update in TF card and insert TF card in slot，
2: Press ESC key (right side of the screen) at the same time when you turning on the tablet
3: Follow the instructions appeared on the screen, the device will do the upgrade and restart by itself.
Special emphasis：Pls donot make power failer when you upgrade by TF card to avoid any risk！

=============================================

And it seems you're right, there are no 2.1 ROMs to find for the v2. But some modding has at least started: http://xdaforums.com/showthread.php?t=950343

Robster > Yeah it is a bit confusing, but the 'best practice' only really sounds like a good idea; in reality it just isn't that simple, as everyone has their own most wanted apps, setups and things for which to use the device. Add to that changing methods on how to do stuff with various ROM versions and changing hardware specs, and even a system based on GPL'ed software but no released sources, and what you get is... well, this, basically, until the userbase is large enough to support even better wiki articles etc. - make no mistake, there are a lot of users spending their time on trying their best to help out and improve. If not, you probably wouldn't even have gotten this far, right?

About the rooting, I've rooted the 0117 with Universal Androot 1.6.2 b5, by selecting "Do not install Superuser", no checkmarks in the 2 other fields, and hitting "Go Root". Then I could suddenly use Root Explorer (after reboot). I was messing around with the ADB at the time, so not absolutely sure if I've done something extra that way around (like "adb remount").

About the tethering, I think you're looking for the 'ADHOC' threads - at least I think that's what's needed, not sure. Its darn hard to re-find the resources I've read in the last 24 hours with Slatedroid site forums down right now.