| `/dev/vda14` | BIOS boot (~3 MB) | GRUB core image (BIOS on GPT) |
| `/dev/vda15` | EFI System (vfat) | unused, left alone |
-The flow: **operator converts root to Btrfs, updates `/etc/fstab` and reinstalls GRUB → you install Guix on Debian → create `@guix`
+The flow: **operator boots into recovery mode, you convert root to Btrfs, update `/etc/fstab` and reinstall GRUB → you install Guix on Debian → create `@guix`
subvolume → `guix system init` into it → boot Guix → delete the old Debian files.**
---
-## Phase 1 — Operator, in recovery mode
+## Phase 1 — After Operator boots into recovery mode
-See `sporestack-btrfs-convert-request.md` for the version to send to support. The operator
-makes **three required changes**:
+You make **three required changes**:
1. Convert the filesystem.
2. Update the root entry in `/etc/fstab`.
---
-## Phase 2 — You, on Debian (root is now Btrfs)
+## Phase 2 — Operator boots back into the root filesystem, on Debian (root is now Btrfs)
-### 2.1 Verify the operator's changes and make root writable
+### 2.1 Verify the changes and make root writable
```sh
findmnt -no SOURCE,FSTYPE,OPTIONS / # expect /dev/vda1 btrfs … (may be ro, see below)