fix(t2): drop the superseded firmware package before adding the fetcher

install/hardware/apple/fix-t2.sh

@@ -3,6 +3,17 @@
 if lspci -nn | grep "106b:180[12]" >/dev/null; then
   echo "Detected MacBook with T2 chip. Installing support items..."
 
+  # The fetcher replaced the packaged firmware upstream and declares
+  # Conflicts=apple-bcm-firmware, so a machine that already carries the old
+  # package (an earlier install) must drop it first or the noninteractive
+  # transaction fails. Fresh installs have nothing to drop, which is a no-op.
+  omarchy-pkg-drop apple-bcm-firmware
+
+  # apple-bcm-firmware-fetcher reads its firmware off an on-disk macOS volume —
+  # Wi-Fi firmware for T2 Macs is only legally obtainable from there. A
+  # single-boot install that wiped macOS has no such volume, so the fetch comes
+  # up empty; those machines need the firmware supplied from a macOS copy or a
+  # downloaded recovery image instead.
   omarchy-pkg-add \
     linux-t2 \
     linux-t2-headers \

test/shell.d/t2-hardware-test.sh

@@ -20,6 +20,16 @@ grep -Fq 'KERNEL_CMDLINE[default]+=" intel_iommu=on iommu=pt pm_async=off mem_sl
   fail "T2 setup leaves optional Touch Bar customization uninstalled"
 ! grep -qx 'tiny-dfr' "$other_packages" ||
   fail "the ISO no longer caches tiny-dfr"
+grep -Fq 'apple-bcm-firmware-fetcher' "$fix_t2" ||
+  fail "T2 setup installs the firmware fetcher"
+grep -Fq 'omarchy-pkg-drop apple-bcm-firmware' "$fix_t2" ||
+  fail "T2 setup drops the superseded firmware package before the fetcher conflicts with it"
+! grep -Fq 'apple-bcm-firmware \' "$fix_t2" ||
+  fail "T2 setup no longer adds the superseded firmware package"
+grep -Fq 'apple-bcm-firmware-fetcher' "$other_packages" ||
+  fail "the default package list installs the firmware fetcher"
+! grep -qx 'apple-bcm-firmware' "$other_packages" ||
+  fail "the default package list no longer names the superseded firmware package"
 pass "fresh T2 setup uses t2bce-compatible suspend, fan, and Touch Bar defaults"
 
 test_tmp=$(mktemp -d)