diff --git a/README.md b/README.md
index 7f9a461..f001eaa 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,7 @@
+Modded version of enso to add support for 03.600.31 DevKit and TestKit firmwares.
+
+# Building: 
+
 You need [vitasdk](https://vitasdk.org/).
 
 1. `make` the payload
diff --git a/first b/first
new file mode 100644
index 0000000..6f1f91c
Binary files /dev/null and b/first differ
diff --git a/installer/CMakeLists.txt b/installer/CMakeLists.txt
index 4ed0058..f640db2 100644
--- a/installer/CMakeLists.txt
+++ b/installer/CMakeLists.txt
@@ -78,8 +78,9 @@ target_link_libraries(${SHORT_NAME}
   taihen_stub
   emmc_helper_user_stub_weak
 )
-
+set(VITA_MAKE_FSELF_FLAGS "${VITA_MAKE_FSELF_FLAGS} -a 0x2808000000000000")
 vita_create_self(${SHORT_NAME}.self ${SHORT_NAME} UNSAFE)
+set(VITA_MAKE_FSELF_FLAGS "${VITA_MAKE_FSELF_FLAGS} -a 0x2f00000000000001")
 
 # emmc_helper: kernel version
 add_executable(emmc_helper
diff --git a/installer/src/kernel.c b/installer/src/kernel.c
index 58e3e54..774fd10 100644
--- a/installer/src/kernel.c
+++ b/installer/src/kernel.c
@@ -29,6 +29,8 @@ enum {
 
 	OS0_SIZE = 0x3820 * BLOCK_SIZE,
 	OS0_CRC32 = 0xb776951d,
+	OS0_CRC32_TOOL = 0x1461191e,
+	OS0_CRC32_DEX = 0xd9c8046b,
 };
 
 typedef struct {
@@ -196,7 +198,7 @@ int check_os0(void) {
 	}
 
 	printf("got os0 crc32: 0x%08x\n", crc);
-	if (crc != OS0_CRC32) {
+	if ((crc != OS0_CRC32) && (crc != OS0_CRC32_TOOL) && (crc != OS0_CRC32_DEX)) {
 		printf("error: crc does not match!\n");
 		ret = -1;
 	} else {
diff --git a/second b/second
new file mode 100644
index 0000000..f0e192d
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