You should not need to update the firmware on a Mars 3--it should be version  4.4.3x or better "from the factory", press the "System" button on the main menu to determine the firmware version. V 4.4.x is needed to create the encrypted .ctb files the printer expects.

What is giving you the "UNKNOWN FORMAT FILE" message, Chitubox or the printer?  What is the file type (filename extension) of the files you have "downloaded to slice"? it needs to a .stl (STereo Lithography) 3D model file to be loaded into Chitubox (there are other formats it can read, but for simplicity's sake let's not "go there" right now).

After you slice the model it needs to be saved as a .ctb file for printing.

Hey!
I just checked. I have 4.4.3. 

Here is everything I have tried.:

1. Changed USB Stick.
2. I slice models (STL) and then save as CBT.
I've looked at firmware which you say is fine if I have 4.4.4 which I do.
3. Downloaded, sliced and saved with Chitubox Free 1.8.1., 1.9.0  and the Pro Chitubox.

I can't find ANYTHING online about this issue. Everywhere I look it seems other have the same issue, but have solved it one way or the other which I posted above.

So. I figured it out. In all my reading no one told me I had to tell Chitubox which printer I was using. Now that is fixed I can see the model on my printer and it recognizes the file format, but now says the model doesn't fit -4098. I'm new to this so I have no idea what to do.

At the risk of being annoying, reading the user manual would have helped:

If the model is too large there should be a message askiung if you wish to resize it when loading. If not use the "Scale" function on the main screen and click "Scale to Fit" (make sure the "Lock Ratio" buttun is depressed as shown below):

I honestly did all this and I'm still getting the message. As for the model being too large. I see no red areas on the model to indicate that it is too large for the plate.
.

Can you post a screenshot of the message you are getting?

I was having this issue.  When I downloaded Chitubox 1.9.1 today I realized it hadn't filled-in the product info correctly.  It wouldn't let me delete my default printer so I added the Mars 3 again and then erase the old profile.  This fixed the issue.

The default printer cannot be deleted until after you have configured another...

Make sure you are downloading files in compatible formats for your Mars 3 printer, such as .STL or .OBJ, and consider updating your slicing software to the latest version and follow the manufacturer's instructions carefully for firmware updates and seek support from the printer manufacturer if needed to address any ongoing issues. io games

Make sure you are using the latest version of both Chitubox and the firmware for the Mars 3 3D printer. Sometimes updating the software retro bowl can resolve compatibility issues.

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