diff --git a/source/firm.c b/source/firm.c
index 301839fba..14fa54c5f 100755
--- a/source/firm.c
+++ b/source/firm.c
@@ -43,7 +43,9 @@ static const firmSectionHeader *section;
 u32 config,
     emuOffset;
 
-bool isN3DS, isDevUnit, isFirmlaunch;
+bool isN3DS,
+     isDevUnit,
+     isFirmlaunch;
 
 FirmwareSource firmSource;
 
@@ -253,6 +255,11 @@ static inline u32 loadFirm(FirmwareType firmType)
 
     if(!isN3DS && firmType == NATIVE_FIRM && firmVersion < 0x25)
     {
+        //We can't boot < 3.x NANDs
+        if(firmVersion < 0x18)
+            error("An old unsupported NAND has been detected.\nLuma3DS is unable to boot it.");
+
+        //We can't boot a 4.x NATIVE_FIRM, load one from SD
         if(!fileRead(firm, "/luma/firmware.bin") || (((u32)section[2].address >> 8) & 0xFF) != 0x68)
             error("An old unsupported FIRM has been detected.\nCopy firmware.bin in /luma to boot");