diff --git a/firmware/export/config-m200v4.h b/firmware/export/config-m200v4.h
index de66788f75..b5c4f56b9f 100644
--- a/firmware/export/config-m200v4.h
+++ b/firmware/export/config-m200v4.h
@@ -138,7 +138,7 @@
 
 #define BOOTFILE_EXT "sansa"
 #define BOOTFILE "rockbox." BOOTFILE_EXT
-#define BOOTDIR "/"
+#define BOOTDIR "/.rockbox"
 
 #define IBSS_ATTR_VOICE_STACK
 #define ICODE_ATTR_TREMOR_NOT_MDCT
diff --git a/rbutil/mkamsboot/dualboot.S b/rbutil/mkamsboot/dualboot.S
index 8cadca8174..4d19b020a3 100644
--- a/rbutil/mkamsboot/dualboot.S
+++ b/rbutil/mkamsboot/dualboot.S
@@ -119,7 +119,7 @@ uclcopy:
         cmp   r1, #0             /* C3 = #0 means button pressed */
         beq   boot_of
 #elif defined(SANSA_M200V4)
-        /* SELECT button */
+        /* LEFT button */
 .set row, (1<<5) /* enable output on A5 */
         ldr   r0, =GPIOA
         mov   r1, #row
@@ -129,9 +129,9 @@ uclcopy:
 .set col, (1<<0) /* read keyscan column A0 */
         ldr   r2, [r0, #(4*col)]
 
-        /* check value read (0 means button pressed) */
+        /* check value read (1 means button pressed) */
         cmp   r2, #0
-        beq   boot_of
+        bne   boot_of
 #else
         #error No target-specific key check defined!
 #endif