Endpoint manager/Grandstream 3240 says "Download/read firmware errors, please check network or..."

I configured a new Grandstream 3240 with the commercial endpoint manager. At each boot it shows “Download/read firmware errors, please check network or…” (can’t read the rest of it). The phone works but I don’t like this error showing up. Anyone have any tips?

Just looked and there is no gxv3240.bin for this phone like there is for the others. Am I supposed to download the bin file and install it in tftpboot/grandstream manually?