diff --git a/ChangeLog b/ChangeLog
index 3a6e59c050..800e4bfe7f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -12,6 +12,8 @@
             Add `E.errorFlag` event to allow JS to respond to internal errors
             Use Esc[J VT100 code when cycling through command history (much faster REPL on low bandwidth connections)
             ESP8266: Remove debugger again as it will never work on 8266
+            ESP8266: Enable unaligned reads for ESP8266_4MB (fix #1240,#837)
+            ESP8266: move code save section to fist partition for memory mapping for ESP8266_4MB (fix #1240)
             ESP8266: Add GPIO16 as D16 without watch (#1206) but soft PWM/I2C/SPI/etc 
 
      1v94 : Allow Espruino boards to reset straight out of the DFU Bootloader             
diff --git a/boards/ESP8266_4MB.py b/boards/ESP8266_4MB.py
index d82e5b57b4..65b399a6ac 100644
--- a/boards/ESP8266_4MB.py
+++ b/boards/ESP8266_4MB.py
@@ -51,8 +51,8 @@
   'adc'     : 1,
   'dac'     : 0,
   'saved_code' : {
-    # 0x300000 + 4096 * (256 - 16save - 1wifi -4reserved) 
-    'address' :  0x3EB000, # first page is used for wifi save 
+    # 0x000000 + 4096 * (256 - 16save - 1wifi -4reserved) 
+    'address' :  0x0EB000, # first page is used for wifi save 
     'page_size' : 4096,
     'pages' : 16,
     'flash_available' : 940, # firmware can be up to this size
diff --git a/libs/network/esp8266/jswrap_esp8266_network.c b/libs/network/esp8266/jswrap_esp8266_network.c
index 272229308b..30094c4b60 100644
--- a/libs/network/esp8266/jswrap_esp8266_network.c
+++ b/libs/network/esp8266/jswrap_esp8266_network.c
@@ -842,8 +842,8 @@ void jswrap_wifi_save(JsVar *what) {
   conf->crc = crc32((uint8_t*)flashBlock, sizeof(flashBlock));
   DBG("Wifi.save: len=%d vers=%d crc=0x%08lx\n", conf->length, conf->version, (long unsigned int) conf->crc);
   if (map == 6 ) {
-    jshFlashErasePage( 0x3FB000);
-    jshFlashWrite(conf,0x3FB000, sizeof(flashBlock));    
+    jshFlashErasePage( 0x0FB000);
+    jshFlashWrite(conf,0x0FB000, sizeof(flashBlock));    
   } else {  
     jshFlashErasePage(0x7B000);
     jshFlashWrite(conf, 0x7B000, sizeof(flashBlock));
@@ -858,7 +858,7 @@ void jswrap_wifi_restore(void) {
   os_memset(flashBlock, 0, sizeof(flashBlock));
   uint32_t map = system_get_flash_size_map();
   if (map == 6 ) {
-    jshFlashRead(flashBlock, 0x3FB000, sizeof(flashBlock));
+    jshFlashRead(flashBlock, 0x0FB000, sizeof(flashBlock));
   } else {
     jshFlashRead(flashBlock, 0x7B000, sizeof(flashBlock));
   }  
diff --git a/make/family/ESP8266.make b/make/family/ESP8266.make
index 6c16eca09f..8871a0577e 100644
--- a/make/family/ESP8266.make
+++ b/make/family/ESP8266.make
@@ -66,6 +66,11 @@ CFLAGS+= -fno-builtin \
 -Wno-parentheses -Wno-type-limits -Wno-unused-function -Wno-unused-value \
 -Wl,EL -Wl,--gc-sections -nostdlib -mlongcalls -mtext-section-literals
 
+# only use mfore-l32 if 4MB board for now
+ifdef FLASH_4MB 
+CFLAGS += -mforce-l32
+endif
+
 #
 # The Root of the ESP8266_SDK distributed by Espressif
 # This must be supplied as a Make environment variable.
diff --git a/targets/esp8266/jshardware.c b/targets/esp8266/jshardware.c
index 8bd2d5f0a1..59c2678b13 100644
--- a/targets/esp8266/jshardware.c
+++ b/targets/esp8266/jshardware.c
@@ -1340,7 +1340,7 @@ JsVar *jshFlashGetFree() {
     addFlashArea(jsFreeFlash, 0x300000, 0x40000);
     addFlashArea(jsFreeFlash, 0x340000, 0x40000);
     addFlashArea(jsFreeFlash, 0x380000, 0x40000);
-    addFlashArea(jsFreeFlash, 0x3C0000, 0x40000-0x15000);
+    addFlashArea(jsFreeFlash, 0x3C0000, 0x40000);
     return jsFreeFlash;
   }