I can not say as I never tried it with an unmodified firmware but I do not see how it would not work since we are just forcing power to the card.
It sounds much more scary and risky than it is! However, the risk is more inline with writing to a floppy disk. I have put an Titan ridge firmware on an Alpine ridge just to see if it would break it. The card did not work but when I hooked it up to the programer and put an Alpine ridge firmware back onto the card it was working again. I also had a time where the SOC clip got bumped by my tornado child and I had the write fail tested the card and did not work so I ran the programer again write completed and the card worked fine.
I think there is one person that has messed up the chip but I am pretty sure they removed/desoddered it from the motherboard since they could not get the SOC clip to attach.
Modified firmware downloads:
Yes I can boot from the USB Great! That means something might be wrong with the EFI partition of the internal Mojave SSD. Please mount EFI partition of Mojave SSD. Compress and upload the CLOVER folder. You may remove serial numbers from SMBIOS section of config.plist before compressing and...
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Flashing processes:
I do not have one so I think that the best choice would be to buy the: https://www.reveltronics.com/en/shop/18/7/chip-programmers/revelprog-is-serial-device-eeprom-flash-programmer-usb-detail The only difference is I could go get it now. I tried the RPi last night with a (badly) doctored set...
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Modified DROM:
@CaseySJ @Elias64Fr Could we dump the nvmem of the Thunderbolt controller using Linux from /sys/bus/thunderbolt/devices/0-0/nvm_active0/nvmem, patch the 7 bytes if applicable, and then do host NVM upgrade using these instructions? Here's the nvmem file I have dumped, it's 516,096 bytes, I'm not...
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