1. I bought MattCard on their CMIzapper site. Everything working fine.
2. Path for correctly using MattCard: Receive letter with card from post-office -> read/backup information from MattCard -> create your efi-backup from your working macOS on your laptop -> patch your efi-backup -> write patched efi-backup to MattCard -> install card to your laptop. You can complete all of this steps without any directional computers - every steps can be completed on your upgradable laptop. Please, read this instruction for more details
https://forums.macrumors.com/thread...ssd-to-m-2-nvme.2034976/page-65#post-26224320
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Hi. You should create efi-backup from your upgradable laptop and update this backup with driver from MBP 15 2015. It's not very difficult, I can help you with patch your backup. But, first of all, read this instruction for more details
https://forums.macrumors.com/thread...ssd-to-m-2-nvme.2034976/page-65#post-26224320.
p.s. 1. I install MattCard with patched backup to MBP 15 mid 2014 two month ago - all (and hibernation) working perfect. 2. You need buy sop 8 clip+CH341A Pro for flashing MattCard OR j6100 flashing cable+CH341A Pro for flashing efi-card on your motherboard(need another working laptop)