For the record, C7 generally means core not installed. It can also happen when you flash too high in Mb and have a ghost core. You see it. But, it does not function.
You may have one of a few reasons why updated cores do not work for you. They have worked for a majority of people, thus far.
1. Using old hakchi2
2. Not properly uninstalling previous HMODS.
3. Not having retroarch hmod installed.
4. Security conflict (refer to my access denied video).
5. Memory conflict (flashing too many Mb in games.
6. Command lines wrong.
7. Master Bios not installed for systems dependent on them.
8. Incorrect rom sets.
I would suggest you do the following.
0. Use hakchi2 2.17
1. Uninstall all HMODS
2. Uninstall Hakchi2
3. Delete temp folder from hakchi2 directory.
4. Flash custom & Original Kernel
5. Flash Games
6. Install retroarch hmod plus others.
Try the updated snes 2010 as a starter core. Then test others. I have had over 50 people test these cores, of which only 2 had issues which the above steps remedied.
Keep me posted
You should be back in current hmod action, soon enough
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I generally run them all via retroarch. And, a majority use the simple R1 to eject, L1 to flip, R1 to insert, just like in my FDS Test video.
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Retroarch settings, quick settings, load core.
Or, while connected to hakchi2, uninstall module option, while system is properly situated to be read.