diff --git a/embed/bootloader/bootui.c b/embed/bootloader/bootui.c
index 95787ba1..a5723075 100644
--- a/embed/bootloader/bootui.c
+++ b/embed/bootloader/bootui.c
@@ -182,7 +182,7 @@ void ui_screen_install_confirm_upgrade(const vendor_header * const vhdr, const i
 void ui_screen_install_confirm_newvendor(const vendor_header * const vhdr, const image_header * const hdr)
 {
     display_bar(0, 0, DISPLAY_RESX, DISPLAY_RESY, COLOR_WHITE);
-    display_text(16, 32, "Re-install firmware", -1, FONT_NORMAL, COLOR_BLACK, COLOR_WHITE, 0);
+    display_text(16, 32, "Vendor change", -1, FONT_NORMAL, COLOR_BLACK, COLOR_WHITE, 0);
     display_bar(16, 44, DISPLAY_RESX - 14 * 2, 1, COLOR_BLACK);
     display_icon(16, 54, 32, 32, toi_icon_info + 12, sizeof(toi_icon_info) - 12, COLOR_BLACK, COLOR_WHITE);
     display_text(55, 70, "Install firmware by", -1, FONT_NORMAL, COLOR_BLACK, COLOR_WHITE, 0);
diff --git a/tools/binctl b/tools/binctl
index 95979408..16250f40 100755
--- a/tools/binctl
+++ b/tools/binctl
@@ -232,11 +232,8 @@ class VendorHeader(object):
         return header
 
     def sign(self, sigmask, signature):
-        if sigmask >= (1 << self.vsig_n):
-            raise Exception('signature index is higher than vsig_n (%d)' % self.vsig_n)
-        if bin(sigmask).count('1') != self.vsig_m:
-            raise Exception('invalid number of indexes (vsig_m expected %d, got %d)' % (self.vsig_m, bin(sigmask).count('1')))
-        # sign
+        header = self.serialize_header(sig=False)
+        assert len(header) == self.hdrlen
         self.sigmask = sigmask
         self.sig = signature