diff --git a/install.sh b/install.sh
old mode 100644
new mode 100755
index c35f052..c8d809b
--- a/install.sh
+++ b/install.sh
@@ -119,16 +119,16 @@ install_deps() {
 #==============================================================================
 
 detect_defaults() {
-    # Auto-detect primary network interface
-    IFACE_DEFAULT=$(ip route get 1.1.1.1 2>/dev/null | awk '{print $5; exit}')
+    # Auto-detect primary network interface (graceful fallback if ip route fails)
+    IFACE_DEFAULT=$(ip route get 1.1.1.1 2>/dev/null | awk '{print $5; exit}' || true)
     [ -z "$IFACE_DEFAULT" ] && IFACE_DEFAULT="eth0"
 
     # Auto-detect gateway
-    GATEWAY_DEFAULT=$(ip route get 1.1.1.1 2>/dev/null | awk '{print $3; exit}')
+    GATEWAY_DEFAULT=$(ip route get 1.1.1.1 2>/dev/null | awk '{print $3; exit}' || true)
     [ -z "$GATEWAY_DEFAULT" ] && GATEWAY_DEFAULT="10.2.0.10"
 
     # Auto-detect DNS from resolv.conf
-    DNS_DEFAULT=$(grep '^nameserver' /etc/resolv.conf 2>/dev/null | awk '{print $2}' | tr '\n' ',' | sed 's/,$//')
+    DNS_DEFAULT=$( (grep '^nameserver' /etc/resolv.conf 2>/dev/null || true) | awk '{print $2}' | tr '\n' ',' | sed 's/,$//')
     [ -z "$DNS_DEFAULT" ] && DNS_DEFAULT="1.1.1.1,8.8.8.8"
 }
 
@@ -314,7 +314,7 @@ detect_zoraxy() {
     # --- Check Docker ---
     if command -v docker &>/dev/null && docker info &>/dev/null 2>&1; then
         local zoraxy_container
-        zoraxy_container=$(docker ps --format '{{.Names}} {{.Image}}' 2>/dev/null | grep -i zoraxy | head -1 | awk '{print $1}')
+        zoraxy_container=$(docker ps --format '{{.Names}} {{.Image}}' 2>/dev/null | grep -i zoraxy | head -1 | awk '{print $1}' || true)
         if [ -n "$zoraxy_container" ]; then
             ZORAXY_MODE="docker"
             info "Found Zoraxy in Docker container: ${BOLD}$zoraxy_container${NC}"
@@ -421,7 +421,7 @@ install_zoraxy_fresh() {
     # Download latest release
     local latest_url
     latest_url=$(curl -s https://api.github.com/repos/tobychui/zoraxy/releases/latest \
-        | jq -r ".assets[] | select(.name | contains(\"$binary\")) | .browser_download_url" 2>/dev/null)
+        | jq -r ".assets[] | select(.name | contains(\"$binary\")) | .browser_download_url" 2>/dev/null || true)
 
     if [ -z "$latest_url" ] || [ "$latest_url" = "null" ]; then
         err "Failed to fetch Zoraxy download URL. Check your internet connection."