Missing SSD during Linux mint installation

[u/-AgbomKennedy]

/r/linuxmint/comments/1x6cx82/missing_ssd_during_linux_mint_installation/

Hello everyone, I need help with my Lenovo ThinkPad E14 Gen 3 AMD Ryzen 7 with 16GB RAM and 1 TB memory. I previously had Linux mint installed on my internal SSD, but after accidentally removing their boot entries from the BIOS boot menu, I could no longer boot into either operating system. I tried selecting NVMe0, but returned me to the boot menu and I tried using NVMe1 but during the installation the internal drive still wasn't seen. I created a bootable Linux Mint Cinnamon USB, which boots successfully, but Linux Mint cannot detect my internal SSD. The BIOS also doesn't show any information about the SSD, and the Linux Mint installer only shows my USB drive. I have tried "lsblk" and "sudo fdisk -l", but I couldn't find the internal drive. I also couldn't find AHCI, RAID, or VMD settings in my BIOS. Since my laptop uses an AMD Ryzen 7 processor, I'm unsure whether the online advice about Intel RST applies. Has anyone experienced this issue or knows how to troubleshoot it? I want to recover my existing files, so I don't want to format the drive or reinstall an operating system until I understand the problem. Any help would be appreciated.