![]() (Not flashing folder, which indicates no usable system at all, or device found) NO APPROVED EFI version found supporting this system year/cinfiguration. ![]() Which of these do you believe is causing a MacBook Pro, mid-2009, C2D at 2.53ghz, 4g ram, 240g ssd from booting from any SSD device, and showing the “prohibitive" circle with slash icon. But, I need assistance on firmware, and advice of all types, please. This is what is leading me to believe that it must be one of these issues. It starts fine with any rotational drive, with efi signature, completing the exact same build procedures, used with an SSD build. ![]() Another fact, that I may have not mentioned. My current situation, after doing everything that should enable any system drive with efi, to successfully start this MacBook pro. Sometimes, it's the simple things we miss, like changing the selection for the startup drive in system preferences (which I have done). I am more likely to add ideas to help others. I'm not in this for profit, and I rarely post for help on here. I also assist our underpaid and overworked teachers to afford a totally refurbished MacBook Pro, at my cost for parts. I try to help keep e-waste to a minimum, and assist low-income Mac users afford an older MacBook Pro, that is still worthy of use with modifications developed to the OS by smarter people than me. I have done everything a tech, of 22 years, can do on this one.
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