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Used jank method to migrate win10, unsure of next step

I used gpart to copy my data from the primary partition on my C drive (old m.2 ssd) to an external HDD, then replaced the m.2 with a samsung nvme ssd since I only have one m.2 slot. I then used gpart to copy the data onto the samsung ssd. Unsurprisingly it didn't just magically boot, and didn't appear in the bios as a bootable drive. My question is what am I missing, should I use a windows boot media to repair my installation or is there something else that would work. I made a back up of everything prior to this whole process as well as not removing the data from the old ssd, incase restoring the backup and somehow telling it to put the data on the new ssd instead of the old is a viable option.

Thanks in advance for any advice.

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if you have data backed up, why not go for a full reinstall. Format your new M.2 and be hassle free. 

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You likely need to reconfigure the BCD. You need a Windows 10 installer on a USB stick, which you will boot from and go to the command prompt to do these steps:

bootrec /FixBoot

bootrec /ScanOs

bootrec /RebuildBcd

Might also need

bcdboot C:\Windows

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