Hi. It is recommended that you update the printer firmware. If it is a .ctb file cut out by Chitubox Pro, the printer needs to update the firmware to read and print. To use CHITUBOX Pro, your computer and 3D printer need to satisfy the minimum system and printer firmware requirements listed on the CHITUBOX Download download page. https://www.chitubox.com/en/download/chitubox-pro
What they need to do is give better instructions. We just set up our Elegoo Mars Pro 2 and got the 'unknown file format' error. After much frustration I figured out how to do it simply. They actually give you THREE files to download. So yeah, download all three of the files. THEN..I had photos but I guess I can't post them, so in words:
Open the ELEGOO MARS 2 PRO Firmware.... file folder Then open the 'Machine Firmware folder" You will see 3 files: mars2prochitu main... , Update.SH4 and V2_P316_CTB_ZNP04_F23.CBD
Select and Copy these three files to your flash drive.
Insert the flash drive into your 3D printer. Select PRINT Select the .SH4 file and hit the Print (sideways triangle) button-when finished installing, press Confirm Next select the .CBD file and hit Print (sideways triangle) button-when finished installing, press confirm Finally, select the mars2prochitu Mainb.....TXT file and hit Print (sideways triangle button)-when finished installing, press Confirm. Go back to your main screen and then turn the power to the 3D printer off. Wait 10 seconds, turn the printer back on and then find your file you want to print and GO!
This has raised its head again today. I just updated to another newer firmware on my Mars 2 V4.3.13-F2.23 and now with Chitubox ver 1.9 the mars doesnt recognise the file type and I have had to roll back to Chitubox 1.8.1to get prints to work.