diff --git a/.gitattributes b/.gitattributes
index 79847f7f..fcaecb86 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -30,3 +30,4 @@
 *.zip  binary
 *.tar.gz binary
 *.meta4 binary
+*.zim  binary
diff --git a/iiab-android b/iiab-android
index edfb19c3..f6ff2ae8 100644
--- a/iiab-android
+++ b/iiab-android
@@ -414,6 +414,35 @@ install_demo_contents() {
   ok "Demo content processing finished!"
 }
 
+#-----------------------------
+# K2Go welcome ZIM (post-install)
+#-----------------------------
+# Runs AFTER Ansible, so it never touches state during the role run. The
+# upstream iiab/iiab kiwix role drops a placeholder test.zim "when
+# kiwix_zims.matched == 0"; here we remove it, drop in our multilingual welcome
+# ZIM (shipped in the cloned repo under static/zim/), and rebuild the Kiwix
+# library ONCE so library.xml reflects the final state.
+install_welcome_zim() {
+  is_role_enabled "kiwix" || { log "Kiwix off; skipping welcome ZIM."; return 0; }
+  local src="${K2GO_OPT_DIR}/static/zim/k2go_welcome.zim"
+  local zim_dir="/library/zims/content"
+  # Ansible already created this dir when kiwix installed; we never create it.
+  [ -d "$zim_dir" ] || { warn "No $zim_dir (kiwix not installed?); skipping."; return 0; }
+
+  rm -f "$zim_dir/test.zim"                     # drop the upstream placeholder
+  if [ -f "$src" ]; then
+    cp -a "$src" "$zim_dir/k2go_welcome.zim"    # ships in the cloned repo
+  else
+    warn "Welcome ZIM not found at $src; nothing installed."
+  fi
+
+  if command -v iiab-make-kiwix-lib >/dev/null 2>&1; then
+    iiab-make-kiwix-lib                          # rebuild library.xml once
+  else
+    warn "iiab-make-kiwix-lib not found; library not rebuilt."
+  fi
+}
+
 #-----------------------------
 # Install IIAB-oA Dashboard
 #-----------------------------
@@ -655,6 +684,9 @@ else
   log "Skipping the demo content installation (ENABLE_DEMO_CONTENTS=0)."
 fi
 
+# Replace the upstream placeholder test.zim with the K2Go welcome ZIM.
+install_welcome_zim
+
 # Install dashboard
 install_iiaboa_dashboard
 
diff --git a/static/zim/README.md b/static/zim/README.md
new file mode 100644
index 00000000..dd877234
--- /dev/null
+++ b/static/zim/README.md
@@ -0,0 +1,16 @@
+# static/zim — bundled ZIM assets
+
+Small ZIM files that ship **with the K2Go repo** and are copied into
+`/library/zims/content` at install time (see `install_welcome_zim` in the
+top-level `iiab-android` wrapper).
+
+## k2go_welcome.zim
+
+A tiny multilingual welcome page (the K2Go logo ringed by "Welcome" in 33
+languages; the footer tagline auto-detects the device language via
+`navigator.language`). It replaces the upstream placeholder `test.zim` that
+iiab/iiab's kiwix role would otherwise install, so a fresh box always opens on a
+branded welcome instead of a blank library.
+
+`*.zim` is marked `binary` in `.gitattributes`. If the file ever grows large,
+consider Git LFS.
diff --git a/static/zim/k2go_welcome.zim b/static/zim/k2go_welcome.zim
new file mode 100644
index 00000000..b9251827
Binary files /dev/null and b/static/zim/k2go_welcome.zim differ
diff --git a/ROOTFS_SIZE_PILOT_ANALYSIS.md b/tools/ROOTFS_SIZE_PILOT_ANALYSIS.md
similarity index 100%
rename from ROOTFS_SIZE_PILOT_ANALYSIS.md
rename to tools/ROOTFS_SIZE_PILOT_ANALYSIS.md