If you are using fcmb:
Goto fcmb configurator and turn on fastboot, setup your esr path (should be mc?://APPS/ESR.ELF for both the ESR path thingy and the menu item one then goto "Save CNF to MC*" * = 0 or 1 depending on which slot your fcmb memory card is in. Then goto FCMB Restart at the bottom and it should automagically load up any esr disc.
*IF* You manually launch ESR through either FCMB menu or ULaunchElf and you see the ESR logo and then it goes to black screen (and stays there for more than like a minute with no colors) then there is something wrong with your disc you burned. This means either A, the disc image was not made/patched correctly, or b, bad media.
PSTWO Slim Silver v15 NTSC/US
PSP Slim Silver Daxter Edition 5.00-M33 custom firmware
Xbox1 60gb Hard drive all softmod with UnleashX
Xbox1 Stock HD Red/Black Case Softmod UnleashX
Fire Red GBA-SP