If you encounter C1-2738-0 while trying to use (PSP emulator) or playing PS1/PSP backups, the issue is often related to the 661.PBP firmware file or missing plugins.
The most common and simplest solution is to synchronize your trophies with the PlayStation Network (PSN). application on your Vita. ps vita c127380 fixed
" VitaScout: Enhanced Exploration Mode"