diff --git a/scripts/boot/blitz-watchdog.sh b/scripts/boot/blitz-watchdog.sh
index da75343..e41b4ac 100644
--- a/scripts/boot/blitz-watchdog.sh
+++ b/scripts/boot/blitz-watchdog.sh
@@ -172,6 +172,7 @@ record_full_restart() {
 restart_bside_targeted() {
   local fault_key="$1"
   local reason="$2"
+  local rc
 
   if register_targeted_restart "${fault_key}"; then
     blitz_log "${STEP}" "escalate-full-restart" "start" "reason=${reason}" 0
@@ -184,11 +185,12 @@ restart_bside_targeted() {
   blitz_log "${STEP}" "restart-bside" "start" "reason=${reason}" 0
   if systemctl restart "${B_SIDE_SERVICE}"; then
     blitz_log "${STEP}" "restart-bside" "success" "reason=${reason}" 0
-  else
-    rc=$?
-    blitz_log "${STEP}" "restart-bside" "failure" "reason=${reason}" "${rc}"
-    return "${rc}"
+    return 0
   fi
+
+  rc=$?
+  blitz_log "${STEP}" "restart-bside" "failure" "reason=${reason}" "${rc}"
+  return "${rc}"
 }
 
 full_restart_stack() {
@@ -203,28 +205,32 @@ full_restart_stack() {
   blitz_log "${STEP}" "full-restart-stop-bside" "start" "reason=${reason}" 0
   systemctl stop "${B_SIDE_SERVICE}" || true
 
-  if ! systemctl restart "${ROS_SERVICE}"; then
+  if systemctl restart "${ROS_SERVICE}"; then
+    blitz_log "${STEP}" "full-restart-restart-ros" "success" "reason=${reason}" 0
+  else
     rc=$?
     blitz_log "${STEP}" "full-restart-restart-ros" "failure" "reason=${reason}" "${rc}"
     record_full_restart
     return "${rc}"
   fi
-  blitz_log "${STEP}" "full-restart-restart-ros" "success" "reason=${reason}" 0
 
-  if ! bash "${SCRIPT_DIR}/wait-for-unix-socket.sh" --step "${STEP}" --timeout "${BLITZ_ROS_SOCKET_WAIT_SEC}"; then
+  if bash "${SCRIPT_DIR}/wait-for-unix-socket.sh" --step "${STEP}" --timeout "${BLITZ_ROS_SOCKET_WAIT_SEC}"; then
+    :
+  else
     rc=$?
     blitz_log "${STEP}" "full-restart-wait-socket" "failure" "reason=${reason}" "${rc}"
     record_full_restart
     return "${rc}"
   fi
 
-  if ! systemctl start "${B_SIDE_SERVICE}"; then
+  if systemctl start "${B_SIDE_SERVICE}"; then
+    blitz_log "${STEP}" "full-restart-start-bside" "success" "reason=${reason}" 0
+  else
     rc=$?
     blitz_log "${STEP}" "full-restart-start-bside" "failure" "reason=${reason}" "${rc}"
     record_full_restart
     return "${rc}"
   fi
-  blitz_log "${STEP}" "full-restart-start-bside" "success" "reason=${reason}" 0
   record_full_restart
 }
 
@@ -282,13 +288,17 @@ perform_network_recovery() {
   blitz_log "${STEP}" "network-recovery" "start" "fail_count=${NETWORK_FAIL_COUNT}" 0
   systemctl stop "${B_SIDE_SERVICE}" || true
 
-  if ! bash "${SCRIPT_DIR}/5g-dial.sh"; then
+  if bash "${SCRIPT_DIR}/5g-dial.sh"; then
+    :
+  else
     rc=$?
-    blitz_log "${STEP}" "network-redial" "failure" "fail_count=${NETWORK_FAIL_COUNT}" "${rc}"
+    blitz_log "${STEP}" "network-redial" "failure" "fail_count=${NETWORK_FAIL_COUNT} script=${SCRIPT_DIR}/5g-dial.sh" "${rc}"
     return "${rc}"
   fi
 
-  if ! wait_for_network_recovery "${BLITZ_5G_ROUTE_WAIT_SEC}"; then
+  if wait_for_network_recovery "${BLITZ_5G_ROUTE_WAIT_SEC}"; then
+    :
+  else
     rc=$?
     blitz_log "${STEP}" "network-recovery" "failure" "fail_count=${NETWORK_FAIL_COUNT} interface=${NETWORK_LAST_INTERFACE:-unresolved}" "${rc}"
     return "${rc}"
diff --git a/scripts/boot/common.sh b/scripts/boot/common.sh
index bf9256a..467b6f3 100644
--- a/scripts/boot/common.sh
+++ b/scripts/boot/common.sh
@@ -204,14 +204,18 @@ blitz_route_ready() {
   return 0
 }
 
-blitz_resolve_5g_interface() {
-  local explicit_interface="${BLITZ_5G_INTERFACE:-}"
-  local info_json="${BLITZ_5G_INFO_JSON:-}"
+blitz_interface_exists() {
+  local interface_name="${1:-}"
 
-  if [[ -n "${explicit_interface}" ]]; then
-    printf '%s\n' "${explicit_interface}"
-    return 0
+  if [[ -z "${interface_name}" ]]; then
+    return 1
   fi
+  ip link show dev "${interface_name}" >/dev/null 2>&1
+}
+
+blitz_read_5g_info_interface() {
+  local info_json="$1"
+
   if [[ -z "${info_json}" || ! -f "${info_json}" ]]; then
     return 1
   fi
@@ -236,6 +240,156 @@ print(interface)
 PY
 }
 
+blitz_detect_5g_interface_from_subnet() {
+  local modem_subnet="${1:-${BLITZ_5G_MODEM_SUBNET:-}}"
+
+  if [[ -z "${modem_subnet}" ]]; then
+    return 1
+  fi
+
+  python3 - "${modem_subnet}" <<'PY'
+import ipaddress
+import json
+import subprocess
+import sys
+
+subnet = ipaddress.ip_network(sys.argv[1], strict=False)
+skip = {"lo", "docker0", "l4tbr0"}
+
+def priority(name: str) -> tuple[int, str]:
+    if name.startswith("enx"):
+        return (0, name)
+    if name.startswith("wwan"):
+        return (1, name)
+    if name.startswith("usb"):
+        return (2, name)
+    if name.startswith("eth"):
+        return (3, name)
+    return (9, name)
+
+try:
+    output = subprocess.check_output(["ip", "-j", "-4", "addr", "show"], text=True)
+    payload = json.loads(output)
+except Exception:
+    raise SystemExit(1)
+
+candidates = []
+for item in payload:
+    ifname = str(item.get("ifname") or "").strip()
+    if not ifname or ifname in skip:
+        continue
+    for addr in item.get("addr_info") or []:
+        if addr.get("family") != "inet":
+            continue
+        local = addr.get("local")
+        prefixlen = addr.get("prefixlen")
+        if not local or prefixlen is None:
+            continue
+        try:
+            iface = ipaddress.ip_interface(f"{local}/{prefixlen}")
+        except ValueError:
+            continue
+        if iface.ip in subnet:
+            candidates.append((priority(ifname), ifname))
+            break
+
+if not candidates:
+    raise SystemExit(1)
+
+candidates.sort(key=lambda item: item[0])
+print(candidates[0][1])
+PY
+}
+
+blitz_refresh_5g_info_json() {
+  local interface_name="$1"
+  local info_json="${2:-${BLITZ_5G_INFO_JSON:-}}"
+
+  if [[ -z "${interface_name}" || -z "${info_json}" ]]; then
+    return 1
+  fi
+
+  python3 - "${interface_name}" "${info_json}" <<'PY'
+import json
+import os
+import subprocess
+import sys
+
+interface_name = sys.argv[1]
+path = sys.argv[2]
+
+try:
+    output = subprocess.check_output(["ip", "-j", "addr", "show", "dev", interface_name], text=True)
+    payload = json.loads(output)
+except Exception:
+    raise SystemExit(1)
+
+if not payload:
+    raise SystemExit(1)
+
+item = payload[0]
+ipv4 = []
+ipv6 = []
+for addr in item.get("addr_info") or []:
+    local = addr.get("local")
+    prefixlen = addr.get("prefixlen")
+    family = addr.get("family")
+    if not local or prefixlen is None:
+        continue
+    entry = f"{local}/{prefixlen}"
+    if family == "inet":
+        ipv4.append(entry)
+    elif family == "inet6":
+        ipv6.append(entry)
+
+data = {
+    "interface": interface_name,
+    "ipv4": ipv4,
+    "ipv6": ipv6,
+}
+
+parent = os.path.dirname(path)
+if parent:
+    os.makedirs(parent, exist_ok=True)
+temp_path = f"{path}.tmp.{os.getpid()}"
+with open(temp_path, "w", encoding="utf-8") as handle:
+    json.dump(data, handle, ensure_ascii=False, indent=2)
+os.replace(temp_path, path)
+PY
+}
+
+blitz_resolve_5g_interface() {
+  local explicit_interface="${BLITZ_5G_INTERFACE:-}"
+  local info_json="${BLITZ_5G_INFO_JSON:-}"
+  local recorded_interface=""
+  local detected_interface=""
+
+  if [[ -n "${explicit_interface}" ]]; then
+    if blitz_interface_exists "${explicit_interface}"; then
+      printf '%s\n' "${explicit_interface}"
+      return 0
+    fi
+    return 1
+  fi
+
+  recorded_interface="$(blitz_read_5g_info_interface "${info_json}" || true)"
+  if [[ -n "${recorded_interface}" ]] && blitz_interface_exists "${recorded_interface}"; then
+    printf '%s\n' "${recorded_interface}"
+    return 0
+  fi
+
+  detected_interface="$(blitz_detect_5g_interface_from_subnet || true)"
+  if [[ -n "${detected_interface}" ]]; then
+    if [[ "${detected_interface}" != "${recorded_interface}" ]]; then
+      blitz_refresh_5g_info_json "${detected_interface}" "${info_json}" >/dev/null 2>&1 || true
+    fi
+    printf '%s\n' "${detected_interface}"
+    return 0
+  fi
+
+  return 1
+}
+
 blitz_prepare_runtime_dir() {
   local runtime_dir