BACKUP all data first. No guarantee this won't break your NVMe
Download the ISO from the Samsung SSD tools page.
Install tools
sudo apt-get install -y gzip unzip wget cpio
Mount the ISO:
mkdir /mnt/iso
sudo mount -o loop /root/Samsung_SSD_990_PRO_8B2QJXD7.iso /mnt/iso
Extract and Run:
mkdir /tmp/fwupdate
cd /tmp/fwupdate
gzip -dc /mnt/iso/initrd | cpio -idv --no-absolute-filenames
sudo ./root/fumagician/fumagician
Reboot after the tool confirms success.