diff --git a/lesson/ooc/lesson_04_ooc_pin/project/basic.uvprojx b/lesson/ooc/lesson_04_ooc_pin/project/basic.uvprojx
index 7b74082ec7bf1eb5dabd7848bb82d01f8079e76b..c4b690ae5f2ecd1bb597d0076e5142c020f9f4fb 100644
--- a/lesson/ooc/lesson_04_ooc_pin/project/basic.uvprojx
+++ b/lesson/ooc/lesson_04_ooc_pin/project/basic.uvprojx
@@ -10,7 +10,7 @@
       <TargetName>Basic</TargetName>
       <ToolsetNumber>0x4</ToolsetNumber>
       <ToolsetName>ARM-ADS</ToolsetName>
-      <pCCUsed>5060960::V5.06 update 7 (build 960)::.\ARMCC</pCCUsed>
+      <pCCUsed>5060061::V5.06 update 1 (build 61)::.\ARMCC</pCCUsed>
       <uAC6>0</uAC6>
       <TargetOption>
         <TargetCommonOption>
@@ -186,6 +186,7 @@
             <RvdsVP>0</RvdsVP>
             <RvdsMve>0</RvdsMve>
             <RvdsCdeCp>0</RvdsCdeCp>
+            <nBranchProt>0</nBranchProt>
             <hadIRAM2>0</hadIRAM2>
             <hadIROM2>0</hadIROM2>
             <StupSel>8</StupSel>
diff --git a/lesson/ooc/lesson_04_ooc_pin/user/eio_pin.c b/lesson/ooc/lesson_04_ooc_pin/user/eio_pin.c
index 8be2041f7bf8ec82bb04f2feb000b1a28ba786eb..96c9d49c7bb7dd9d4af9a536a5318a750acb156e 100644
--- a/lesson/ooc/lesson_04_ooc_pin/user/eio_pin.c
+++ b/lesson/ooc/lesson_04_ooc_pin/user/eio_pin.c
@@ -132,9 +132,9 @@ static bool _check_pin_name_valid(const char *name)
         goto exit;
     }
     
-    if (!((name[0] < 'A' && name[0] > 'D') &&
-            (name[2] < '0' && name[2] > '1') &&
-            (name[3] < '0' && name[3] > '9')))
+    if (!((name[0] >= 'A' && name[0] <= 'D') &&
+            (name[2] >= '0' && name[2] <= '1') &&
+            (name[3] >= '0' && name[3] <= '9')))
     {
         ret = false;
         goto exit;