diff --git a/bootloader/xduoox3.c b/bootloader/xduoox3.c
index 3db87a866d..d38639bfd4 100644
--- a/bootloader/xduoox3.c
+++ b/bootloader/xduoox3.c
@@ -44,6 +44,7 @@
 extern void show_logo(void);
 extern void power_off(void);
 
+#ifdef HAVE_BOOTLOADER_USB_MODE
 static void show_splash(int timeout, const char *msg)
 {
     reset_screen();
@@ -88,6 +89,7 @@ static void usb_mode(void)
         }
     }
 }
+#endif
 
 static int boot_rockbox(void)
 {
@@ -95,11 +97,17 @@ static int boot_rockbox(void)
     void (*kernel_entry)(void);
 
     printf("Mounting disk...\n");
-    rc = disk_mount_all();
-    if (rc <= 0)
+
+    while((rc = disk_mount_all()) <= 0)
     {
         verbose = true;
-        error(EDISK,rc, true);
+#ifdef HAVE_BOOTLOADER_USB_MODE
+        error(EDISK, rc, false);
+        usb_start_monitoring();
+        usb_mode();
+#else
+        error(EDISK, rc, true);
+#endif
     }
 
     printf("Loading firmware...\n");
@@ -119,6 +127,7 @@ static int boot_rockbox(void)
     }
 }
 
+#if 0
 static void reset_configuration(void)
 {
     int rc;
@@ -135,6 +144,7 @@ static void reset_configuration(void)
     else
         show_splash(HZ/2, "Couldn't reset configuration!");
 }
+#endif
 
 int main(void)
 {
@@ -151,8 +161,6 @@ int main(void)
 
     show_logo();
 
-    filesystem_init();
-
     rc = storage_init();
     if(rc)
     {
@@ -160,6 +168,22 @@ int main(void)
         error(EATA, rc, true);
     }
 
+    filesystem_init();
+
+#ifdef HAVE_BOOTLOADER_USB_MODE
+    button_init_device();
+    int btn = button_read_device();
+
+    usb_init();
+
+    /* Enter USB mode if USB is plugged and PLAY button is pressed */
+    if(btn & BUTTON_PLAY) {
+        usb_start_monitoring();
+        if(usb_detect() == USB_INSERTED)
+            usb_mode();
+    }
+#endif /* HAVE_BOOTLOADER_USB_MODE */
+
     /* Don't mount the disks yet, there could be file system/partition errors
        which are fixable in USB mode */
 
diff --git a/firmware/export/config/xduoox3.h b/firmware/export/config/xduoox3.h
index 6a7f33c842..d4d6f2ee2f 100644
--- a/firmware/export/config/xduoox3.h
+++ b/firmware/export/config/xduoox3.h
@@ -163,6 +163,7 @@
 
 /* enable these for the experimental usb stack */
 #define HAVE_USBSTACK
+#define HAVE_BOOTLOADER_USB_MODE
 
 /* Connect by events, not by tick polling */
 #define USB_STATUS_BY_EVENT
diff --git a/firmware/target/mips/ingenic_jz47xx/debug-jz4760.c b/firmware/target/mips/ingenic_jz47xx/debug-jz4760.c
index 848fa5343e..ffd9faaf60 100644
--- a/firmware/target/mips/ingenic_jz47xx/debug-jz4760.c
+++ b/firmware/target/mips/ingenic_jz47xx/debug-jz4760.c
@@ -169,3 +169,106 @@ bool dbg_hw_info(void)
     }
     return true;
 }
+
+#define CFG_UART_BASE           UART1_BASE      /* Base of the UART channel */
+
+void serial_putc (const char c)
+{
+        volatile u8 *uart_lsr = (volatile u8 *)(CFG_UART_BASE + OFF_LSR);
+        volatile u8 *uart_tdr = (volatile u8 *)(CFG_UART_BASE + OFF_TDR);
+
+        if (c == '\n') serial_putc ('\r');
+
+        /* Wait for fifo to shift out some bytes */
+        while ( !((*uart_lsr & (UARTLSR_TDRQ | UARTLSR_TEMT)) == 0x60) );
+
+        *uart_tdr = (u8)c;
+}
+
+void serial_puts (const char *s)
+{
+        while (*s) {
+                serial_putc (*s++);
+        }
+}
+
+void serial_putsf(const char *format, ...)
+{
+    static char printfbuf[256];
+    int len;
+    unsigned char *ptr;
+    va_list ap;
+    va_start(ap, format);
+
+    ptr = printfbuf;
+    len = vsnprintf(ptr, sizeof(printfbuf), format, ap);
+    va_end(ap);
+    (void)len;
+
+    serial_puts(ptr);
+    serial_putc('\n');
+}
+
+void serial_put_hex(unsigned int  d)
+{
+        char c[12];
+        int i;
+        for(i = 0; i < 8;i++)
+        {
+                c[i] = (d >> ((7 - i) * 4)) & 0xf;
+                if(c[i] < 10)
+                        c[i] += 0x30;
+                else
+                        c[i] += (0x41 - 10);
+        }
+        c[8] = '\n';
+        c[9] = 0;
+        serial_puts(c);
+
+}
+void serial_put_dec(unsigned int  d)
+{
+        char c[16];
+        int i;
+        int j = 0;
+        int x = d;
+
+        while (x /= 10)
+                j++;
+
+        for (i = j; i >= 0; i--) {
+                c[i] = d % 10;
+                c[i] += 0x30;
+                d /= 10;
+        }
+        c[j + 1] = '\n';
+        c[j + 2] = 0;
+        serial_puts(c);
+}
+
+void serial_dump_data(unsigned char* data, int len)
+{
+        int i;
+        for(i=0; i<len; i++)
+        {
+                unsigned char a = ((*data)>>4) & 0xf;
+                if(a < 10)
+                        a += 0x30;
+                else
+                        a += (0x41 - 10);
+                serial_putc( a );
+
+                a = (*data) & 0xf;
+                if(a < 10)
+                        a += 0x30;
+                else
+                        a += (0x41 - 10);
+                serial_putc( a );
+
+                serial_putc( ' ' );
+
+                data++;
+        }
+
+        serial_putc( '\n' );
+}
diff --git a/firmware/target/mips/ingenic_jz47xx/xduoo_x3/sadc-xduoo_x3.c b/firmware/target/mips/ingenic_jz47xx/xduoo_x3/sadc-xduoo_x3.c
index 16d5aab782..be02167a5d 100644
--- a/firmware/target/mips/ingenic_jz47xx/xduoo_x3/sadc-xduoo_x3.c
+++ b/firmware/target/mips/ingenic_jz47xx/xduoo_x3/sadc-xduoo_x3.c
@@ -18,7 +18,7 @@
  * KIND, either express or implied.
  *
  ****************************************************************************/
- 
+
 #include "config.h"
 #include "system.h"
 #include "cpu.h"
@@ -86,11 +86,13 @@ bool button_hold(void)
 
 int button_read_device(void)
 {
+#ifndef BOOTLOADER
     static bool hold_button = false;
     bool hold_button_old;
 
     hold_button_old = hold_button;
     hold_button = (__gpio_get_pin(PIN_BTN_HOLD) ? true : false);
+#endif
 
     int btn = BUTTON_NONE;
     bool gpio_btn = (__gpio_get_pin(PIN_BTN_POWER) ? false : true);