diff --git a/lib/core/settings.py b/lib/core/settings.py
index 754aaad85..66065bf8f 100644
--- a/lib/core/settings.py
+++ b/lib/core/settings.py
@@ -19,7 +19,7 @@ from lib.core.enums import DBMS_DIRECTORY_NAME
 from lib.core.enums import OS
 
 # sqlmap version (<major>.<minor>.<month>.<monthly commit>)
-VERSION = "1.3.1.11"
+VERSION = "1.3.1.12"
 TYPE = "dev" if VERSION.count('.') > 2 and VERSION.split('.')[-1] != '0' else "stable"
 TYPE_COLORS = {"dev": 33, "stable": 90, "pip": 34}
 VERSION_STRING = "sqlmap/%s#%s" % ('.'.join(VERSION.split('.')[:-1]) if VERSION.count('.') > 2 and VERSION.split('.')[-1] == '0' else VERSION, TYPE)
diff --git a/txt/checksum.md5 b/txt/checksum.md5
index 125a98093..1cfe5de24 100644
--- a/txt/checksum.md5
+++ b/txt/checksum.md5
@@ -49,7 +49,7 @@ fe370021c6bc99daf44b2bfc0d1effb3  lib/core/patch.py
 9a7d68d5fa01561500423791f15cc676  lib/core/replication.py
 3179d34f371e0295dd4604568fb30bcd  lib/core/revision.py
 d6269c55789f78cf707e09a0f5b45443  lib/core/session.py
-de869bb9eb40f7f621d766c6560d0c13  lib/core/settings.py
+9c1d73674867a376be098517216c6c05  lib/core/settings.py
 a8a7501d1e6b21669b858a62e921d191  lib/core/shell.py
 5dc606fdf0afefd4b305169c21ab2612  lib/core/subprocessng.py
 eec3080ba5baca44c6de4595f1c92a0d  lib/core/target.py
@@ -402,11 +402,10 @@ ca3ab78d6ed53b7f2c07ed2530d47efd  udf/postgresql/windows/32/8.4/lib_postgresqlud
 94eec6c5d02357596292d36a8533f08f  waf/anquanbao.py
 7ab1a7cd51a02899592f4f755d36a02e  waf/approach.py
 425f2599f57ab81b4fff67e6b442cccc  waf/armor.py
-fac23fc2e564edaf90a4346f3ee525b0  waf/asm.py
+f0aa6abf1f9af78374e58a64cb33c9de  waf/asm.py
 9dbec5d674ed4c762ffc9bc3ab402739  waf/aws.py
 29b14801171574a3d92a30542a32be54  waf/baidu.py
 4fd9a8e3aac364fe5509b23e7eb5a448  waf/barracuda.py
-2bb132ecea25e947e7e82e32e7dd6b3a  waf/bigip.py
 742f8c9b7f3a858e11dfd2ce3df65c6e  waf/binarysec.py
 ef8c5db49ad9973b59d6b9b65b001714  waf/blockdos.py
 2608fbe2c80fae99bb09db1f93d80cdd  waf/bluedon.py
diff --git a/waf/asm.py b/waf/asm.py
index 6f07d5909..0b757be90 100644
--- a/waf/asm.py
+++ b/waf/asm.py
@@ -5,6 +5,8 @@ Copyright (c) 2006-2019 sqlmap developers (http://sqlmap.org/)
 See the file 'LICENSE' for copying permission
 """
 
+import re
+
 from lib.core.settings import WAF_ATTACK_VECTORS
 
 __product__ = "Application Security Manager (F5 Networks)"
@@ -13,9 +15,10 @@ def detect(get_page):
     retval = False
 
     for vector in WAF_ATTACK_VECTORS:
-        page, _, _ = get_page(get=vector)
+        page, headers, code = get_page(get=vector)
         retval = "The requested URL was rejected. Please consult with your administrator." in (page or "")
         retval |= all(_ in (page or "") for _ in ("This page can't be displayed. Contact support for additional information", "The incident ID is:"))
+        retval |= (code >= 400) and "ID" in (page or "") and re.search(r"\b\d{19}\b", page or "") is not None
         if retval:
             break
 
diff --git a/waf/bigip.py b/waf/bigip.py
deleted file mode 100644
index ff1d5dc78..000000000
--- a/waf/bigip.py
+++ /dev/null
@@ -1,30 +0,0 @@
-#!/usr/bin/env python
-
-"""
-Copyright (c) 2006-2019 sqlmap developers (http://sqlmap.org/)
-See the file 'LICENSE' for copying permission
-"""
-
-import re
-
-from lib.core.enums import HTTP_HEADER
-from lib.core.settings import WAF_ATTACK_VECTORS
-
-__product__ = "BIG-IP Application Security Manager (F5 Networks)"
-
-def detect(get_page):
-    retval = False
-
-    for vector in WAF_ATTACK_VECTORS:
-        _, headers, code = get_page(get=vector)
-        retval = headers.get("X-Cnection", "").lower() == "close"
-        retval |= headers.get("X-WA-Info") is not None
-        retval |= re.search(r"\bTS[0-9a-f]+=", headers.get(HTTP_HEADER.SET_COOKIE, "")) is not None
-        retval |= re.search(r"BigIP|BIGipServer", headers.get(HTTP_HEADER.SET_COOKIE, ""), re.I) is not None
-        retval |= re.search(r"BigIP|BIGipServer", headers.get(HTTP_HEADER.SERVER, ""), re.I) is not None
-        retval |= re.search(r"\AF5\Z", headers.get(HTTP_HEADER.SERVER, ""), re.I) is not None
-        retval &= code >= 400
-        if retval:
-            break
-
-    return retval