diff --git a/etc/mkinitcpio.conf.d/thunderbolt_module.conf b/etc/mkinitcpio.conf.d/thunderbolt_module.conf
index 9518f8b1201..2f145bb5534 100644
--- a/etc/mkinitcpio.conf.d/thunderbolt_module.conf
+++ b/etc/mkinitcpio.conf.d/thunderbolt_module.conf
@@ -1 +1,7 @@
-MODULES+=(thunderbolt)
+# Thunderbolt is x86-oriented hardware and the module is not built for every
+# architecture -- ALARM's aarch64 kernel has no `thunderbolt`. mkinitcpio treats
+# an unresolvable MODULES entry as an error, which fails every initramfs build
+# on such a system, so gate it rather than forcing it unconditionally.
+if [[ $(uname -m) == x86_64 ]]; then
+  MODULES+=(thunderbolt)
+fi
diff --git a/install/post-install/pacman.sh b/install/post-install/pacman.sh
index 23580b3c527..dcf39563ce6 100644
--- a/install/post-install/pacman.sh
+++ b/install/post-install/pacman.sh
@@ -1,7 +1,31 @@
 # Configure pacman after package installation completes. Offline target package
 # installs use the live ISO's offline pacman.conf until this final restore.
-cp -f "$OMARCHY_PATH/default/pacman/pacman-${OMARCHY_MIRROR:-stable}.conf" /etc/pacman.conf
-cp -f "$OMARCHY_PATH/default/pacman/mirrorlist-${OMARCHY_MIRROR:-stable}" /etc/pacman.d/mirrorlist
+case "$(uname -m)" in
+  aarch64)
+    # Omarchy's pacman.conf and mirrorlist describe an x86_64 Arch system:
+    # [multilib] is 32-bit x86 libraries and no ARM mirror carries it, and the
+    # mirrorlist points at Omarchy's mirror of Arch, which is x86_64 only.
+    # Arch Linux ARM also lays its tree out as $arch/$repo rather than Arch's
+    # $repo/os/$arch, so the mirrorlist cannot be reused with a different host.
+    #
+    # Derive the config from Omarchy's instead: drop [multilib], keep [omarchy]
+    # (its $arch placeholder resolves correctly), add Arch Linux ARM's own
+    # [alarm] and [aur] repositories, and leave the mirrorlist the distribution
+    # installed. Skipping this step is not an option: the live ISO's pacman.conf
+    # only knows the offline mirror, which does not exist on the installed system.
+    awk '
+      /^\[multilib\]$/ { skip = 1; next }
+      /^\[/            { skip = 0 }
+      skip             { next }
+      { print }
+    ' "$OMARCHY_PATH/default/pacman/pacman-${OMARCHY_MIRROR:-stable}.conf" >/etc/pacman.conf
+    printf '\n[alarm]\nInclude = /etc/pacman.d/mirrorlist\n\n[aur]\nInclude = /etc/pacman.d/mirrorlist\n' >>/etc/pacman.conf
+    ;;
+  *)
+    cp -f "$OMARCHY_PATH/default/pacman/pacman-${OMARCHY_MIRROR:-stable}.conf" /etc/pacman.conf
+    cp -f "$OMARCHY_PATH/default/pacman/mirrorlist-${OMARCHY_MIRROR:-stable}" /etc/pacman.d/mirrorlist
+    ;;
+esac
 
 # omarchy-settings skips this override until cups-browsed is actually present
 # to avoid pacman creating cups-browsed.conf.pacnew during ISO package install.
diff --git a/install/user/mise-work.sh b/install/user/mise-work.sh
index f77d5561e0e..17ea1e25df9 100644
--- a/install/user/mise-work.sh
+++ b/install/user/mise-work.sh
@@ -19,7 +19,12 @@ case ${OMARCHY_SETUP_CONTEXT:-runtime} in
 esac
 
 if [[ -n $NODE_PACKAGE_DIR ]]; then
-  NODE_TARBALL=$(find "$NODE_PACKAGE_DIR" -name "node-v*-linux-x64.tar.gz" -type f 2>/dev/null | head -n1)
+  # Node names its builds x64/arm64, not by uname
+  case "$(uname -m)" in
+    aarch64) _NODE_ARCH=arm64 ;;
+    *)       _NODE_ARCH=x64   ;;
+  esac
+  NODE_TARBALL=$(find "$NODE_PACKAGE_DIR" -name "node-v*-linux-${_NODE_ARCH}.tar.gz" -type f 2>/dev/null | head -n1)
   if [[ -z $NODE_TARBALL ]]; then
     if [[ ${OMARCHY_SETUP_CONTEXT:-} == "provision-owner" ]]; then
       # A factory snapshot predating the bundled tarball may not have it staged.
@@ -31,7 +36,7 @@ if [[ -n $NODE_PACKAGE_DIR ]]; then
       exit 1
     fi
   else
-    NODE_VERSION=$(basename "$NODE_TARBALL" | sed 's/node-v\(.*\)-linux-x64.tar.gz/\1/')
+    NODE_VERSION=$(basename "$NODE_TARBALL" | sed "s/node-v\\(.*\\)-linux-${_NODE_ARCH}.tar.gz/\\1/")
     NODE_INSTALL_DIR="$HOME/.local/share/mise/installs/node/$NODE_VERSION"
 
     mkdir -p "$NODE_INSTALL_DIR"