Samsung Galaxy Discover SCH-R740C running 4.0.4 fails the JB 4.1 update
Doing some searches to try and help some losts souls with this little phone, there is a download available on several other forums that will update this phone via Odin tar files to a 'stock' 4.1.2 firmware, it's a tool release directly from Samsung and it's available on their website. 

XDA Developer thread for CWM on the SCH-R740c

Samsung download page for upgrade utility