diff --git a/source/main.c b/source/main.c
index 5c1d258..dae36d0 100644
--- a/source/main.c
+++ b/source/main.c
@@ -37,6 +37,7 @@
 #include "crypto.h"
 #include "memory.h"
 #include "screen.h"
+#include "fatfs/sdmmc/sdmmc.h"
 
 extern CfgData configData;
 extern ConfigurationStatus needConfig;
@@ -308,6 +309,12 @@ boot:
         if(nandType == FIRMWARE_SYSNAND) firmSource = FIRMWARE_SYSNAND;
     }
 
+    //If we're using EmuNAND, make sure the SD card isn't write protected
+    if(nandType != FIRMWARE_SYSNAND && (*(vu16*)(SDMMC_BASE + REG_SDSTATUS0) & TMIO_STAT0_WRPROTECT) == 0) 
+    {
+        error("The SD card is locked, EmuNAND can not be used.\n\nPlease turn the write protection switch off.");
+    }
+
     //Same if we're using EmuNAND as the FIRM source
     else if(firmSource != FIRMWARE_SYSNAND)
         locateEmuNand(&firmSource);
diff --git a/source/utils.c b/source/utils.c
index 3725864..e133e6f 100644
--- a/source/utils.c
+++ b/source/utils.c
@@ -109,6 +109,9 @@ void mcuPowerOff(void)
     //Ensure that all memory transfers have completed and that the data cache has been flushed
     flushEntireDCache();
 
+    //Deinitialize the screens
+    deinitScreens();
+
     i2cWriteRegister(I2C_DEV_MCU, 0x20, 1 << 0);
     while(true);
 }