diff --git a/Makefile b/Makefile
index 3cbfb56..ff1c528 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,5 @@
+CFLAGS=
+
 SOURCES := \
 	updater.c \
 	usb_read.c \
@@ -19,10 +21,10 @@ firmware/%.bin.c: firmware/%.bin
 	xxd -i $^ $@
 
 updater: $(SOURCES)
-	gcc -o $@ $^ -lusb-1.0
+	gcc $(CFLAGS) -o $@ $^ -lusb-1.0
 
 usbreset: extra/usbreset.c
-	gcc -o $@ $^
+	gcc $(CFLAGS) -o $@ $^
 
 clean:
 	rm -f updater usbreset firmware/*.c
diff --git a/usb_keyboard.c b/usb_keyboard.c
index 0470d51..0464eee 100644
--- a/usb_keyboard.c
+++ b/usb_keyboard.c
@@ -225,7 +225,7 @@ int write_kb_fw(const unsigned char *data, int data_length)
     if (rc >= 0) {
       break;
     }
-    usleep(100*1000);
+    usleep(500*1000);
   }
 
   if (try == 20) {
diff --git a/usb_touchpad.c b/usb_touchpad.c
index b115cb2..5467f8a 100644
--- a/usb_touchpad.c
+++ b/usb_touchpad.c
@@ -111,7 +111,7 @@ int write_tp_fw(const unsigned char *fw, int fw_length)
     fw_length = 24 * 1024;
 
     printf("[*] Opening in touchpad mode\n");
-    for (try = 0; try < 3; try++) {
+    for (try = 0; try < 20; try++) {
         rc = open_touchpad_mode();
         if (rc >= 0) {
             break;