diff --git a/firmware/data/esp32-config.json b/firmware/data/config.json
similarity index 100%
rename from firmware/data/esp32-config.json
rename to firmware/data/config.json
diff --git a/firmware/platformio.ini b/firmware/platformio.ini
index 5c73b2e..9f9b677 100644
--- a/firmware/platformio.ini
+++ b/firmware/platformio.ini
@@ -27,20 +27,25 @@ lib_deps =
 build_flags =
     -D CORE_DEBUG_LEVEL=0
 
-; ── ESP8266: Camera Bridge ──────────────────────────────────
-; Flashed onto D1 Mini. Talks to GoPro over Wi-Fi, relays to
-; ESP32 over UART (TX/RX pins). No MQTT, no router connection.
+; ── ESP-01S: Camera Bridge ──────────────────────────────────
+; Flashed onto an ESP-01S (ESP8266, 1MB flash). Talks to the GoPro
+; over Wi-Fi, relays to the XIAO over the hardware UART (GPIO1/3).
+; No MQTT, no router connection.
+;
+; Flash with a 3.3V USB-UART adapter: tie GPIO0 → GND, power up /
+; reset into bootloader, then upload. ESP-01S flash is qio/dout;
+; keep upload_speed modest for adapter reliability.
 
 [env:esp8266-camera]
 platform = espressif8266
-board = d1_mini
+board = esp01_1m
 framework = arduino
 monitor_speed = 115200
-upload_speed = 921600
+upload_speed = 115200
 lib_deps = ${common.lib_deps}
 build_flags = ${common.build_flags}
     -D PIO_FRAMEWORK_ARDUINO_MMU_CACHE16_IRAM48_SECHEAP_SHARED
-board_build.flash_mode = dio
+board_build.flash_mode = dout
 board_build.f_cpu = 160000000L
 build_src_filter =
     -<*.cpp>
diff --git a/firmware/src/esp32-mqtt-bridge.cpp b/firmware/src/esp32-mqtt-bridge.cpp
index bfa4c2c..eca958c 100644
--- a/firmware/src/esp32-mqtt-bridge.cpp
+++ b/firmware/src/esp32-mqtt-bridge.cpp
@@ -30,12 +30,12 @@
 #include <WiFiClient.h>
 #include <PubSubClient.h>
 #include <ArduinoJson.h>
-#include <SPIFFS.h>
+#include <LittleFS.h>
 #include <Wire.h>
 #include <U8g2lib.h>
 
 // ────────────────────────────────────────────
-// Configuration (SPIFFS)
+// Configuration (LittleFS)
 // ────────────────────────────────────────────
 
 struct Config {
@@ -54,8 +54,8 @@ struct Config {
 } cfg;
 
 bool loadConfig() {
-  if (!SPIFFS.begin(true)) { Serial.println("[CFG] SPIFFS mount failed"); return false; }
-  File f = SPIFFS.open("/config.json", "r");
+  if (!LittleFS.begin(true)) { Serial.println("[CFG] LittleFS mount failed"); return false; }
+  File f = LittleFS.open("/config.json", "r");
   if (!f) { Serial.println("[CFG] No config — using defaults"); return false; }
 
   JsonDocument doc;
@@ -71,11 +71,14 @@ bool loadConfig() {
   cfg.heartbeat_sec   = doc["heartbeat_interval_sec"] | cfg.heartbeat_sec;
   cfg.bat_raw_min     = doc["bat_raw_min"]   | cfg.bat_raw_min;
   cfg.bat_raw_max     = doc["bat_raw_max"]   | cfg.bat_raw_max;
+  Serial.printf("[CFG] Loaded: ssid=%s broker=%s:%d cam=%s\n",
+                cfg.wifi_ssid.c_str(), cfg.mqtt_broker.c_str(), cfg.mqtt_port,
+                cfg.camera_id.length() ? cfg.camera_id.c_str() : "-");
   return true;
 }
 
 bool saveConfig() {
-  File f = SPIFFS.open("/config.json", "w");
+  File f = LittleFS.open("/config.json", "w");
   if (!f) return false;
   JsonDocument doc;
   doc["wifi_ssid"]     = cfg.wifi_ssid;