MY MID model 729b/pc tablet did come with "TF" card!? Will not connect to my WiFi says cannot authenicate

If the tablet does not have a SIM slot, then the tablet does not support Mobile connectivity through a SIM card. This will mean that you need to use WIFI to connect to the internet.

Most MID (Mobile Internet Device) don't support SIM cards. There are however a few that do. Unfortunately there are many MID 7 devices created by different companies, and it looks like the majority are WIFI only (No SIM support).

I would need more information about the model of your specific device in order to provide a more comprehensive answer.

I have had this problem before and I had to go under WiFi settings and forget my WiFi. I let it scan again for service and reentered my WiFi network information. This worked for me most of the time. However, it could be your WiFi itself. Can you connect anything else to your WiFi?

Make sure your tablet is updated on all its apps and software. If not and it has missed an update your tablet and it will show a authentication and wifi error.

When you selected forget it erases the SSID and password you entered to connect initially so you will have to re- enter the info to reconnect!

Authentication often means "password protection" for the specific wifi connection. Usually your software will present a "dialogue" box telling you a password is necessary and give you an opportunity to enter one.

Here is the manual
Support Manuals
The TF card slot is under the cover at the top near the camera.

"Authentication Error" usually means when you are clicking on the desired wi-fi network and putting in your password you are making a small error in the password. ChecK:
a - You are putting in the correct CaSe. Most are CaSe SpEcIfIc so if it asks for "F" it means "F" and not "f";
b - You are not leaving any spaces before or after the password (some tablets especially seem to leave spaces.)
c - You are possibly putting in the Router Password. This is useless! you need to out in your Wireless Network KEY.
It came with your ISP letter or on a little card or is printed on the router
in the form of:
Name (SSID) Goodwombat45837
Key: HG56TY78JK88

You would type in HG56TY78JK88

Note hg56ty78jk88 would FAIL, you have put in lower case.

Hope this helps a bit.

No I connect by Ethernet cable and still want connect

Can you tell me where you got the upgraded rom from, and have you tried downloading the firmware from the manufacturer's website? http://www.archos.com/us/support/support_tech/updates_fwm.html