legacy/bootloader: soft reset after firmware upload

originally submitted by @kedoubitcoin

legacy/bootloader/usb.c

@@ -19,6 +19,7 @@
 
 #include <libopencm3/stm32/flash.h>
 #include <libopencm3/usb/usbd.h>
+#include <vendor/libopencm3/include/libopencmsis/core_cm3.h>
 
 #include <string.h>
 
@@ -415,9 +416,18 @@ static void rx_callback(usbd_device *dev, uint8_t ep) {
 
     flash_state = STATE_END;
     if (hash_check_ok) {
-      show_unplug("New firmware", "successfully installed.");
       send_msg_success(dev);
-      shutdown();
+      __disable_irq();
+      // wait 3 seconds
+      char line[] = "will be restarted in _ s.";
+      for (int i = 3; i > 0; i--) {
+        line[21] = '0' + i;
+        layoutDialog(&bmp_icon_ok, NULL, NULL, NULL, "New firmware",
+                     "successfully installed.", NULL, "Your Trezor", line,
+                     NULL);
+        delay(30000 * 1000);
+      }
+      scb_reset_system();
     } else {
       layoutDialog(&bmp_icon_warning, NULL, NULL, NULL, "Firmware installation",
                    "aborted.", NULL, "You need to repeat", "the procedure with",

legacy/firmware/usb.c

@@ -432,7 +432,7 @@ void usbPoll(void) {
 void usbReconnect(void) {
   if (usbd_dev != NULL) {
     usbd_disconnect(usbd_dev, 1);
-    delay(1000);
+    delay(120000);
     usbd_disconnect(usbd_dev, 0);
   }
 }