You can put all the bin files on your screen and it will use the correct one by itself.
Company_processor_size_hardware_version_software version(I think).
I sell the tft35_v3_e3
Thank you for your response, Ryan, I should have asked the question better. I am trying to understand the difference between the 3 firmware versions of 3.0.27, 3.0_B1.27 and 3.0_E3.27 firmware versions. When I run the 0_E3.27 on the LR3 I get the M400 error and when I run the 3.0.27 firmware it resolved the m420 error. I am using the 3.0.27 firmware currently and it works great with the dual LR SKR Pro 1.2 configuration so far. (I had the SKR Pro and 3.5" screen when I started this project that had been purchased for another project that got set aside.)
Those are three differnt screens. V2 v3 B1 E3. The screen should pich the correct firmware, if it does not look at the board to see what it says.
I was not loading all three bin files on the sd card. Once I did it is working as it should. I should have done more reading in the forum. Thanks for the help.