diff --git a/firmware/CORE21_special.ZXD b/firmware/CORE21_special.ZXD
new file mode 100644
index 0000000..dcd5ebc
Binary files /dev/null and b/firmware/CORE21_special.ZXD differ
diff --git a/firmware/CORE35_special.ZX2 b/firmware/CORE35_special.ZX2
new file mode 100644
index 0000000..61a2f55
Binary files /dev/null and b/firmware/CORE35_special.ZX2 differ
diff --git a/firmware/bootloader_core21.hex b/firmware/bootloader_core21.hex
index c521bfe..d3e9aa5 100644
--- a/firmware/bootloader_core21.hex
+++ b/firmware/bootloader_core21.hex
@@ -24,9 +24,8 @@ ED
 71
 EF
 FC
-09
-3E
-80
+0B
+AF
 ED
 79
 ED
@@ -38,6 +37,7 @@ FD
 00
 00
 00
+00
 01
 3B
 FD
diff --git a/firmware/bootloader_core35.hex b/firmware/bootloader_core35.hex
index d3e9aa5..c521bfe 100644
--- a/firmware/bootloader_core35.hex
+++ b/firmware/bootloader_core35.hex
@@ -24,8 +24,9 @@ ED
 71
 EF
 FC
-0B
-AF
+09
+3E
+80
 ED
 79
 ED
@@ -37,7 +38,6 @@ FD
 00
 00
 00
-00
 01
 3B
 FD