This is absolutely not needed to get Black/White working on an R4 with Wood 1.12...
Just enter the settings page with the ROM selected, go to the Features tab and turn 'Reset in Game' to Off. Game'll work fine even with cheats enabled. Black is still dead with the C-Gear though. The fact that it works in White but not Black means I can totally believe that Black is a faulty dump.
Cheers!
I use the guid and Pokemon Black Version work perfectly on my N5