Hi. When installing an NVMe drive in my MBP2014 last year the command "sudo nvram enable-legacy-orom-behavior=1" fixed an issue with the non-apple drive, resulting in a faster boot. Last week I wondered why this setting was gone from nvram, so I run it again. However this time it bricked my MBP2014. It doesn't boot anymore, shows a blinking folder instead and none of the key combinations work (recovery, internet recovery, pram reset, smc reset).
It seems like I'm not alone with this problem, see: https://discussions.apple.com/thread/250842029
Unfortunately the "5min pram reset" doesn't work for me. I think my only option is to look for a pram reset on the hardware level, or maybe reflashing the efi boot rom. I don't have the necessary hardware, but I remember having read of a french guy here in the NVMe upgrade thread for MBP2013/14/15 who even managed to flash the 2015 boot rom on his MBP2014, fixing the hibernate/sleep issue that non-apple drives cause in that model.
So my question is:
- Is there any solution that does not require sophisticated hardware for reflashing chips?
- Does a Matt Card fix the problem? (http://www.cmizapper.com/products/mattcard.html)
- Do you know of a repair center in Frankfurt, Germany that can fix the problem for a reasonable price? Let's say less than 70 Euro?
I've asked 3 repair centers so far. The 1st one did not answer. The 2nd one seems to be capable to do the repair, but offered me a complete systemboard fix for 350 Euro, which is more than what's the MBP worth. And the 3rd one recommended the 2nd one. I tend to go with the matt card, as long as it fixes the problem.
It seems like I'm not alone with this problem, see: https://discussions.apple.com/thread/250842029
Unfortunately the "5min pram reset" doesn't work for me. I think my only option is to look for a pram reset on the hardware level, or maybe reflashing the efi boot rom. I don't have the necessary hardware, but I remember having read of a french guy here in the NVMe upgrade thread for MBP2013/14/15 who even managed to flash the 2015 boot rom on his MBP2014, fixing the hibernate/sleep issue that non-apple drives cause in that model.
So my question is:
- Is there any solution that does not require sophisticated hardware for reflashing chips?
- Does a Matt Card fix the problem? (http://www.cmizapper.com/products/mattcard.html)
- Do you know of a repair center in Frankfurt, Germany that can fix the problem for a reasonable price? Let's say less than 70 Euro?
I've asked 3 repair centers so far. The 1st one did not answer. The 2nd one seems to be capable to do the repair, but offered me a complete systemboard fix for 350 Euro, which is more than what's the MBP worth. And the 3rd one recommended the 2nd one. I tend to go with the matt card, as long as it fixes the problem.
