Welcome to the Side Imaging Forums jpc526 (first time poster!), sorry that you are having problems changing the personalized text on your unit. It sounds like you are doing this correctly. Maybe you should try performing a read/write function from/to the SD card. Try making a Screen Snapshot and viewing it on the units and see if that changes anything.
After you have done this if it still does not change; view the Profile.txt file from the SD card on your computer and see if it includes the screen changes that you made or not.