diff --git a/utils/imxtools/sbtools/Makefile b/utils/imxtools/sbtools/Makefile
index 16ae0878b0..eab5b8d27b 100644
--- a/utils/imxtools/sbtools/Makefile
+++ b/utils/imxtools/sbtools/Makefile
@@ -1,7 +1,7 @@
 DEFINES=-DCRYPTO_LIBUSB
 CC=gcc
 LD=gcc
-CFLAGS=-g -std=c99 -W -Wall `pkg-config --cflags libusb-1.0` $(DEFINES)
+CFLAGS=-O3 -g -std=c99 -W -Wall `pkg-config --cflags libusb-1.0` $(DEFINES)
 LDFLAGS=`pkg-config --libs libusb-1.0`
 BINS=elftosb sbtoelf sbloader rsrctool elftosb1
 
diff --git a/utils/imxtools/sbtools/fuze+_key_file.txt b/utils/imxtools/sbtools/keys/fuze+.txt
similarity index 100%
rename from utils/imxtools/sbtools/fuze+_key_file.txt
rename to utils/imxtools/sbtools/keys/fuze+.txt
diff --git a/utils/imxtools/sbtools/keys/zenv.txt b/utils/imxtools/sbtools/keys/zenv.txt
new file mode 100644
index 0000000000..4ee8edd304
--- /dev/null
+++ b/utils/imxtools/sbtools/keys/zenv.txt
@@ -0,0 +1 @@
+6f87780df45854571319733c9b6f896a1bfb4e6d83ae68349c4fbaff2eeb332a0dd300f4c323e0b444301953a3021dc22786fb331093601eeb78d05eecff56f07131f9413a8f3d9a69f83a881b9466756a7c782d4f974bcc5e5302bc5d21e7af065819d4c9b59eb66adda9681be62e2904040bb6768528abd667c45b82f05986