Usually the issue with TPL file is that your browser does not download the whole TPL file.
The TPL file should start with tag
and end with tag
examples above should be formatted as html tags = with "".
Regarding the MIB file modification: use text editor (I like notepad++) and use search and replace feature to replace underscore with minus = instead of _ there needs to be -
the same with ifDescr and panIfDescr.
After the file modification, upload the modified file to XMC and restart the nsserver process.
Good luck.
Regards
Zdeněk Pala