Yes, go to RSWho, right click on the 1769-L30ERM/A, click device properties.
This will show you the Firmware Version number eg 30.11.
You need to use the RSLogix 5000 / Studio 5000 with the same major version as this eg 30.01. (L30ERM was first supported in
Infact, you merely have to have it installed. Opening Studio 5000 V26 and doing an upload should automatically switch to the correct version.
Rather than creating a project then trying to upload, simply open Studio 5000 (no project loaded), go to the communications menu item and hit "Who Active".
Browse to your 1769-L30ERM/A and "upload..."
Hit "select file" and type in the new file name.
If you have a project in the default projects folder with the same name it will try to correlate the project with it. I am not sure if this will give you a weird error like the mismatch you described. If I recall, you can tell it to use a new file anyway, but failing that move that file to a different folder.
If this doesn't work for you, please tell us word for word the error message that appears when you try to upload.
Also there isn't a /B of the 1769-L30ERM yet.