Some time ago I converted an E900 to E1100 and as there is a difference in screen size the graphics were all over the place, some fonts were missing, text fields too long etc. this created loads of errors and would not download to the E1100 however by running a project test, double clicking on the first error and correcting this I could run the test again and repeating this until all errors were cleared, this then allowed me to download the project, on one screen there were some symbols that had been created by the original programmer that seemed not to be in the project I had to re-produce these by looking at the original E900 screens, not ideal and took some time but eventually was able to replace the HMI