diff --git a/README.md b/README.md
index dd37a9c..53ad837 100644
--- a/README.md
+++ b/README.md
@@ -90,12 +90,12 @@ After programming, you will only need to setup your Wifi and BTC address.
 1. Create a file named "config.json" in your card's root, containing the the following structure. Adjust the settings to your needs:  
 {  
   "SSID": "myWifiSSID",  
-  "PW": "myWifiPassword",  
+  "WifiPW": "myWifiPassword",  
   "PoolUrl": "public-pool.io",  
   "PoolPort": 21496,  
   "BtcWallet": "walletID",  
   "Timezone": 2,  
-  "saveStats": false  
+  "SaveStats": false  
 }
 1. Insert the SD card.
 1. Hold down the "reset configurations" button as described below to reset the configurations and/or boot without settings in your nvmemory.
diff --git a/src/drivers/storage/nvMemory.cpp b/src/drivers/storage/nvMemory.cpp
index 0f737aa..cc5f997 100644
--- a/src/drivers/storage/nvMemory.cpp
+++ b/src/drivers/storage/nvMemory.cpp
@@ -29,11 +29,11 @@ bool nvMemory::saveConfig(TSettings* Settings)
 
         // Create a JSON document
         StaticJsonDocument<512> json;
-        json[JSON_KEY_POOLURL] = Settings->PoolAddress;
-        json[JSON_KEY_POOLPORT] = Settings->PoolPort;
-        json[JSON_KEY_WALLETID] = Settings->BtcWallet;
-        json[JSON_KEY_TIMEZONE] = Settings->Timezone;
-        json[JSON_KEY_STATS2NV] = Settings->saveStats;
+        json[JSON_SPIFFS_KEY_POOLURL] = Settings->PoolAddress;
+        json[JSON_SPIFFS_KEY_POOLPORT] = Settings->PoolPort;
+        json[JSON_SPIFFS_KEY_WALLETID] = Settings->BtcWallet;
+        json[JSON_SPIFFS_KEY_TIMEZONE] = Settings->Timezone;
+        json[JSON_SPIFFS_KEY_STATS2NV] = Settings->saveStats;
 
         // Open config file
         File configFile = SPIFFS.open(JSON_CONFIG_FILE, "w");
@@ -84,14 +84,14 @@ bool nvMemory::loadConfig(TSettings* Settings)
                 Serial.print('\n');
                 if (!error)
                 {
-                    Settings->PoolAddress = json[JSON_KEY_POOLURL] | Settings->PoolAddress;
-                    strcpy(Settings->BtcWallet, json[JSON_KEY_WALLETID] | Settings->BtcWallet);
-                    if (json.containsKey(JSON_KEY_POOLPORT))
-                        Settings->PoolPort = json[JSON_KEY_POOLPORT].as<int>();
-                    if (json.containsKey(JSON_KEY_TIMEZONE))
-                        Settings->Timezone = json[JSON_KEY_TIMEZONE].as<int>();
-                    if (json.containsKey(JSON_KEY_STATS2NV))
-                        Settings->saveStats = json[JSON_KEY_STATS2NV].as<bool>();
+                    Settings->PoolAddress = json[JSON_SPIFFS_KEY_POOLURL] | Settings->PoolAddress;
+                    strcpy(Settings->BtcWallet, json[JSON_SPIFFS_KEY_WALLETID] | Settings->BtcWallet);
+                    if (json.containsKey(JSON_SPIFFS_KEY_POOLPORT))
+                        Settings->PoolPort = json[JSON_SPIFFS_KEY_POOLPORT].as<int>();
+                    if (json.containsKey(JSON_SPIFFS_KEY_TIMEZONE))
+                        Settings->Timezone = json[JSON_SPIFFS_KEY_TIMEZONE].as<int>();
+                    if (json.containsKey(JSON_SPIFFS_KEY_STATS2NV))
+                        Settings->saveStats = json[JSON_SPIFFS_KEY_STATS2NV].as<bool>();
                     return true;
                 }
                 else
diff --git a/src/drivers/storage/storage.h b/src/drivers/storage/storage.h
index 5da92e3..76e80cd 100644
--- a/src/drivers/storage/storage.h
+++ b/src/drivers/storage/storage.h
@@ -3,6 +3,9 @@
 
 #include <Arduino.h>
 
+// config files
+
+// default settings
 #define DEFAULT_SSID		"NerdMinerAP"
 #define DEFAULT_WIFIPW		"MineYourCoins"
 #define DEFAULT_POOLURL		"public-pool.io"
@@ -11,16 +14,26 @@
 #define DEFAULT_TIMEZONE	2
 #define DEFAULT_SAVESTATS	false
 
-// JSON config file
-#define JSON_CONFIG_FILE "/config.json"
-#define JSON_KEY_SSID	"SSID"
-#define JSON_KEY_PASW	"PW"
+// JSON config files
+#define JSON_CONFIG_FILE	"/config.json"
+
+// JSON config file SD card (for user interaction, readme.md)
+#define JSON_KEY_SSID		"SSID"
+#define JSON_KEY_PASW		"WifiPW"
 #define JSON_KEY_POOLURL	"PoolUrl"
 #define JSON_KEY_WALLETID	"BtcWallet"
 #define JSON_KEY_POOLPORT	"PoolPort"
 #define JSON_KEY_TIMEZONE	"Timezone"
-#define JSON_KEY_STATS2NV	"saveStats"
+#define JSON_KEY_STATS2NV	"SaveStats"
 
+// JSON config file SPIFFS (different for backward compatibility with existing devices)
+#define JSON_SPIFFS_KEY_POOLURL		"poolString"
+#define JSON_SPIFFS_KEY_POOLPORT	"portNumber"
+#define JSON_SPIFFS_KEY_WALLETID	"btcString"
+#define JSON_SPIFFS_KEY_TIMEZONE	"gmtZone"
+#define JSON_SPIFFS_KEY_STATS2NV	"saveStatsToNVS"
+
+// settings
 struct TSettings
 {
 	String WifiSSID{ DEFAULT_SSID };