diff --git a/installer/wad/0001000154484246.tmd b/installer/wad/0001000154484246.tmd
index 954f82f..6922738 100644
Binary files a/installer/wad/0001000154484246.tmd and b/installer/wad/0001000154484246.tmd differ
diff --git a/source/Prompts/prompt_update.cpp b/source/Prompts/prompt_update.cpp
index 2c0ddc6..f287f4b 100644
--- a/source/Prompts/prompt_update.cpp
+++ b/source/Prompts/prompt_update.cpp
@@ -14,8 +14,10 @@
 #include "Network/update.h"
 #include "Network/http.h"
 
+#include <fstream>
+#include <ios>
 
-#/*** Extern variables ***/
+/*** Extern variables ***/
 extern GuiWindow * mainWindow;
 extern bool boot_buffer;
 
@@ -101,6 +103,12 @@ updatePrompt(string rev)
 	char url[100];
 	sprintf(url, "http://download.tuxfamily.org/hbf/DOL/rev%s/boot.dol", rev.c_str());
 
+	// copy boot.dol to prev.dol
+	std::ifstream infile((Settings.device_dat + ":/apps/HomebrewFilter/boot.dol").c_str(), std::ios_base::binary);
+	std::ofstream outfile((Settings.device_dat + ":/apps/HomebrewFilter/prev.dol").c_str(), std::ios_base::binary);
+
+	outfile << infile.rdbuf();
+
 	struct block file = downloadfile(url);
 	if (file.data && file.size > 0)
 	{
diff --git a/updates b/updates
index a6d41f1..3c9f038 100644
--- a/updates
+++ b/updates
@@ -1,3 +1,6 @@
+//rev37:
+- before updating copy the old boot.dol to prev.dol
+
 //rev36:
 - HBF is now OpenSource!
 - Added license-text of GNU GPL v2