diff --git a/c23.patch b/c23.patch
deleted file mode 100644
index 3828d0f..0000000
--- a/c23.patch
+++ /dev/null
@@ -1,22 +0,0 @@
-diff --git a/common/toolcommon/tool-config-file-common.c b/common/toolcommon/tool-config-file-common.c
-index 609e7a3b3..20dfad512 100644
---- a/common/toolcommon/tool-config-file-common.c
-+++ b/common/toolcommon/tool-config-file-common.c
-@@ -78,14 +78,14 @@ _config_file_bool (conffile_t cf,
-                    void *app_ptr,
-                    int app_data)
- {
--  int *bool;
-+  int *value;
- 
-   assert (data);
-   assert (optionname);
-   assert (option_ptr);
- 
--  bool = (int *)option_ptr;
--  *bool = data->boolval;
-+  value = (int *)option_ptr;
-+  *value = data->boolval;
-   return (0);
- }
- 
diff --git a/c99.patch b/c99.patch
new file mode 100644
index 0000000..6c5d47b
--- /dev/null
+++ b/c99.patch
@@ -0,0 +1,30 @@
+diff -ruN freeipmi-1.6.11/ipmi-sensors/ipmi-sensors-oem-intel.c freeipmi-1.6.11.new/ipmi-sensors/ipmi-sensors-oem-intel.c
+--- freeipmi-1.6.11/ipmi-sensors/ipmi-sensors-oem-intel.c	2022-08-31 07:17:04.000000000 +0200
++++ freeipmi-1.6.11.new/ipmi-sensors/ipmi-sensors-oem-intel.c	2023-02-06 16:36:12.866440828 +0100
+@@ -34,6 +34,7 @@
+ #include "ipmi-sensors-oem-intel.h"
+ #include "ipmi-sensors-oem-intel-s5500wb.h"
+ #include "ipmi-sensors-oem-intel-s2600jf.h"
++#include "ipmi-sensors-oem-intel-s2600wp.h"
+ #include "ipmi-sensors-oem-intel-quanta-qssc-s4r.h"
+ #include "ipmi-sensors-oem-intel-node-manager.h"
+ 
+diff -ruN freeipmi-1.6.11/libfreeipmi/sel/ipmi-sel-string-supermicro-common.h freeipmi-1.6.11.new/libfreeipmi/sel/ipmi-sel-string-supermicro-common.h
+--- freeipmi-1.6.11/libfreeipmi/sel/ipmi-sel-string-supermicro-common.h	2022-08-31 07:17:05.000000000 +0200
++++ freeipmi-1.6.11.new/libfreeipmi/sel/ipmi-sel-string-supermicro-common.h	2023-02-06 15:17:56.023720145 +0100
+@@ -39,4 +39,15 @@
+                                                                  unsigned int *wlen,
+                                                                  struct ipmi_sel_system_event_record_data *system_event_record_data);
+ 
++int sel_string_output_supermicro_dimm_event_data2_event_data3 (ipmi_sel_ctx_t ctx,
++                                                               struct ipmi_sel_entry *sel_entry,
++                                                               uint8_t sel_record_type,
++                                                               char *buf,
++                                                               unsigned int buflen,
++                                                               unsigned int flags,
++                                                               unsigned int *wlen,
++                                                               struct ipmi_sel_system_event_record_data *system_event_record_data,
++                                                               int *oem_rv);
++
++
+ #endif /* IPMI_SEL_STRING_SUPERMICRO_COMMON_H */
diff --git a/freeipmi.spec b/freeipmi.spec
index 797a66a..7798d09 100644
--- a/freeipmi.spec
+++ b/freeipmi.spec
@@ -1,10 +1,10 @@
 Name:             freeipmi
-Version:          1.6.15
+Version:          1.6.11
 Release:          %autorelease
 Summary:          IPMI remote console and system management software
 License:          GPL-3.0-or-later
-URL:              https://www.gnu.org/software/freeipmi/
-Source0:          https://ftp.gnu.org/gnu/%{name}/%{name}-%{version}.tar.gz
+URL:              http://www.gnu.org/software/freeipmi/
+Source0:          http://ftp.gnu.org/gnu/%{name}/%{name}-%{version}.tar.gz
 Source1:          bmc-watchdog.service
 Source2:          ipmidetectd.service
 Source3:          ipmiseld.service
@@ -16,9 +16,8 @@ BuildRequires:    automake
 BuildRequires:    autoconf
 BuildRequires:    libtool
 
-# https://lists.gnu.org/archive/html/freeipmi-devel/2025-02/msg00000.html
-# https://github.com/chu11/freeipmi-mirror/commit/ececf09d6128cbff65e9048f19d191e87f111059
-Patch0:           c23.patch
+
+Patch0:           c99.patch
 
 %description
 The FreeIPMI project provides "Remote-Console" (out-of-band) and
diff --git a/sources b/sources
index 8a58988..b5fea19 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (freeipmi-1.6.15.tar.gz) = 113005f751a22584b657afa27c5659af8cae3b503f7c6358ac98c7f2461165c882b9ccfa8ad1cc4e3041f10de334def9b4faff03f2b83d56e69d891463f8931a
+SHA512 (freeipmi-1.6.11.tar.gz) = db37bb1ec559f88764ac08491b616d24e49c9a8ba070717e940fea4886d877819064cb00221aac703d0d149dc38e562924e192e992222e18b0e8b548248487a4