That’s another common error, when you are moving the files from computer on to SDCARD, make sure that they do not goes in parent folder.
For example, if you have downloaded file called: HN+R_EU_AU_P1001.rar when you unpack this file you will get another folder
HN+R_EU_AU_P1001 and inside this folder you can see:
and copy those files on to SDCARD, not with parent folder. This is just an example but related to every firmware/maps update from us.
You have not get to the RED engineering menu (two buttons method)
Please check this video as well