Also just got this printer....
It appears to me that the Chitubox site redirects to the Elegoo firmware update site. The latest version there is V4.4.3-c2_LCDC/1620X2560 /F9.23 as of today (7-23-2021). The printer I have has the same version firmware yours does. When I try to print a sliced file from Chitubox V1.9 is says "Unknown File Format" and won't print. Is this what you get or have you tried the V1.9 software yet?
As for the Chitubox site for updating their software, there's a link in the fine print that gives required minimum firmware version for the Mars 2 Pro. Requires V4.4.3_c2_LCDF. When you click on DOWNLOAD there, it redirects to the Elegoo firmware site (I think). Firmware on the Elegoo site for the Mars 2 Pro is as noted in previous post.
It appears to me that the Chitubox site redirects to the Elegoo firmware update site. The latest version there is V4.4.3-c2_LCDC/1620X2560 /F9.23 as of today (7-23-2021). The printer I have has the same version firmware yours does. When I try to print a sliced file from Chitubox V1.9 is says "Unknown File Format" and won't print. Is this what you get or have you tried the V1.9 software yet?
As for the Chitubox site for updating their software, there's a link in the fine print that gives required minimum firmware version for the Mars 2 Pro. Requires V4.4.3_c2_LCDF. When you click on DOWNLOAD there, it redirects to the Elegoo firmware site (I think). Firmware on the Elegoo site for the Mars 2 Pro is as noted in previous post.