diff --git a/ext/lwip-1.4.1_patched.7z b/ext/lwip-1.4.1_patched.7z
index 072251690..5c5f8c78a 100644
Binary files a/ext/lwip-1.4.1_patched.7z and b/ext/lwip-1.4.1_patched.7z differ
diff --git a/readme.txt b/readme.txt
index 03ca4c3e8..a047fb224 100644
--- a/readme.txt
+++ b/readme.txt
@@ -92,6 +92,8 @@
 - RT:  Merged RT4.
 - NIL: Merged NIL2.
 - NIL: Added STM32F7 demo.
+- VAR: Fixed state check in lwIP when SYS_LIGHTWEIGHT_PROT is disabled
+       (bug #713)(backported to 2.6.10, 3.0.6 and 16.1.4). 
 - RT:  Removed the p_msg field from the thread_t structure saving a
        msg_t-sized field from the structure. Messages now use a new field
        into the p_u union. Now synchronous messages are even faster.