diff --git a/CHANGELOG.md b/CHANGELOG.md
index e778c41a1..80f8e47af 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,13 +11,27 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ## Fixes
 
 - PUS Health Service: Size check for set health command.
-- PUS Health Service: Perform operation completion for announce health command.
-- TCP server: In case of store access error, also pop from the packet FIFO.
+  Perform operation completion for announce health command.
+  https://egit.irs.uni-stuttgart.de/fsfw/fsfw/pulls/746
+- Linux OSAL `getUptime` fix: Check validity of `/proc/uptime` file before reading uptime.
+  https://egit.irs.uni-stuttgart.de/fsfw/fsfw/pulls/745
+- Small tweak for version getter
+  https://egit.irs.uni-stuttgart.de/fsfw/fsfw/pulls/744
 
-## Changes
+## Added
 
-- TCP/IP servers: Make queue depth configurable and explicitely
-  require queue depth to be specified.
+- add CFDP subsystem ID
+  https://egit.irs.uni-stuttgart.de/fsfw/fsfw/pulls/742
+
+## Changed
+- Bump ETL version to 20.35.14
+  https://egit.irs.uni-stuttgart.de/fsfw/fsfw/pulls/748
+- Renamed `PCDU_2` subsystem ID to `POWER_SWITCH_IF`.
+  https://egit.irs.uni-stuttgart.de/fsfw/fsfw/pulls/743
+- Add new `PowerSwitchIF::SWITCH_UNKNOWN` returnvalue.
+  https://egit.irs.uni-stuttgart.de/fsfw/fsfw/pulls/743
+- Assert that `FixedArrayList` is larger than 0 at compile time.
+  https://egit.irs.uni-stuttgart.de/fsfw/fsfw/pulls/740
 
 # [v6.0.0] 2023-02-10
 
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5eddde7ff..5d35e6ff5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -72,7 +72,7 @@ set(FSFW_ETL_LIB_MAJOR_VERSION
     20
     CACHE STRING "ETL library major version requirement")
 set(FSFW_ETL_LIB_VERSION
-    ${FSFW_ETL_LIB_MAJOR_VERSION}.28.0
+    ${FSFW_ETL_LIB_MAJOR_VERSION}.35.14
     CACHE STRING "ETL library exact version requirement")
 set(FSFW_ETL_LINK_TARGET etl::etl)
 
diff --git a/src/fsfw/container/FixedArrayList.h b/src/fsfw/container/FixedArrayList.h
index 97ade7e8f..dde8eb16f 100644
--- a/src/fsfw/container/FixedArrayList.h
+++ b/src/fsfw/container/FixedArrayList.h
@@ -12,6 +12,7 @@ template <typename T, size_t MAX_SIZE, typename count_t = uint8_t>
 class FixedArrayList : public ArrayList<T, count_t> {
   static_assert(MAX_SIZE <= std::numeric_limits<count_t>::max(),
                 "count_t is not large enough to hold MAX_SIZE");
+  static_assert(MAX_SIZE > 0, "MAX_SIZE is 0");
 
  private:
   T data[MAX_SIZE];
diff --git a/src/fsfw/events/fwSubsystemIdRanges.h b/src/fsfw/events/fwSubsystemIdRanges.h
index d8e4ade6f..e395c2f96 100644
--- a/src/fsfw/events/fwSubsystemIdRanges.h
+++ b/src/fsfw/events/fwSubsystemIdRanges.h
@@ -10,7 +10,7 @@ enum : uint8_t {
   CDH = 28,
   TCS_1 = 59,
   PCDU_1 = 42,
-  PCDU_2 = 43,
+  POWER_SWITCH_IF = 43,
   HEATER = 50,
   T_SENSORS = 52,
   FDIR = 70,
@@ -33,6 +33,7 @@ enum : uint8_t {
   PUS_SERVICE_23 = 103,
   MGM_LIS3MDL = 106,
   MGM_RM3100 = 107,
+  CFDP = 108,
 
   FW_SUBSYSTEM_ID_RANGE
 };
diff --git a/src/fsfw/osal/linux/Clock.cpp b/src/fsfw/osal/linux/Clock.cpp
index bfdcf4e20..7dd960e5a 100644
--- a/src/fsfw/osal/linux/Clock.cpp
+++ b/src/fsfw/osal/linux/Clock.cpp
@@ -76,14 +76,17 @@ timeval Clock::getUptime() {
 }
 
 ReturnValue_t Clock::getUptime(timeval* uptime) {
-  // TODO This is not posix compatible and delivers only seconds precision
-  //  Linux specific file read but more precise.
   double uptimeSeconds;
-  if (std::ifstream("/proc/uptime", std::ios::in) >> uptimeSeconds) {
+  std::ifstream ifile("/proc/uptime");
+  if (ifile.bad()) {
+    return returnvalue::FAILED;
+  }
+  if (ifile >> uptimeSeconds) {
     uptime->tv_sec = uptimeSeconds;
     uptime->tv_usec = uptimeSeconds * (double)1e6 - (uptime->tv_sec * 1e6);
+    return returnvalue::OK;
   }
-  return returnvalue::OK;
+  return returnvalue::FAILED;
 }
 
 // Wait for new FSFW Clock function delivering seconds uptime.
diff --git a/src/fsfw/power/Fuse.h b/src/fsfw/power/Fuse.h
index e8b86cfde..c1b35899c 100644
--- a/src/fsfw/power/Fuse.h
+++ b/src/fsfw/power/Fuse.h
@@ -32,7 +32,7 @@ class Fuse : public SystemObject,
     gp_id_t poolIdPower;
   };
 
-  static const uint8_t SUBSYSTEM_ID = SUBSYSTEM_ID::PCDU_1;
+  static const uint8_t SUBSYSTEM_ID = SUBSYSTEM_ID::POWER_SWITCH_IF;
   //! PSS detected that current on a fuse is totally out of bounds.
   static const Event FUSE_CURRENT_HIGH = MAKE_EVENT(1, severity::LOW);
   //! PSS detected a fuse that went off.
diff --git a/src/fsfw/power/PowerSwitchIF.h b/src/fsfw/power/PowerSwitchIF.h
index e8c9aff4c..0b331e118 100644
--- a/src/fsfw/power/PowerSwitchIF.h
+++ b/src/fsfw/power/PowerSwitchIF.h
@@ -28,10 +28,12 @@ class PowerSwitchIF {
   static const ReturnValue_t SWITCH_TIMEOUT = MAKE_RETURN_CODE(2);
   static const ReturnValue_t FUSE_ON = MAKE_RETURN_CODE(3);
   static const ReturnValue_t FUSE_OFF = MAKE_RETURN_CODE(4);
-  static const uint8_t SUBSYSTEM_ID = SUBSYSTEM_ID::PCDU_2;
-  static const Event SWITCH_WENT_OFF = MAKE_EVENT(
-      0, severity::LOW);  //!< Someone detected that a switch went off which shouldn't. Severity:
-                          //!< Low, Parameter1: switchId1, Parameter2: switchId2
+  static const ReturnValue_t SWITCH_UNKNOWN = MAKE_RETURN_CODE(5);
+
+  static const uint8_t SUBSYSTEM_ID = SUBSYSTEM_ID::POWER_SWITCH_IF;
+  //!< Someone detected that a switch went off which shouldn't. Severity:
+  //!< Low, Parameter1: switchId1, Parameter2: switchId2
+  static const Event SWITCH_WENT_OFF = MAKE_EVENT(0, severity::LOW);
   /**
    * send a direct command to the Power Unit to enable/disable the specified switch.
    *
@@ -50,6 +52,7 @@ class PowerSwitchIF {
    * @return
    *     - @c SWITCH_ON if the specified switch is on.
    *     - @c SWITCH_OFF if the specified switch is off.
+   *     - @c SWITCH_UNKNOWN if the state of the specified switch is unknown.
    *     - @c returnvalue::FAILED if an error occured
    */
   virtual ReturnValue_t getSwitchState(power::Switch_t switchNr) const = 0;
diff --git a/src/fsfw/version.cpp b/src/fsfw/version.cpp
index 050187a9a..27d44c03a 100644
--- a/src/fsfw/version.cpp
+++ b/src/fsfw/version.cpp
@@ -1,6 +1,7 @@
 #include "version.h"
 
 #include <cstdio>
+#include <cstring>
 
 #include "fsfw/FSFWVersion.h"
 
@@ -20,7 +21,7 @@ fsfw::Version::Version(int major, int minor, int revision, const char* addInfo)
 
 void fsfw::Version::getVersion(char* str, size_t maxLen) const {
   size_t len = snprintf(str, maxLen, "%d.%d.%d", major, minor, revision);
-  if (addInfo != nullptr) {
+  if (addInfo != nullptr and std::strcmp(addInfo, "") != 0) {
     snprintf(str + len, maxLen - len, "-%s", addInfo);
   }
 }
@@ -30,7 +31,7 @@ namespace fsfw {
 #if FSFW_CPP_OSTREAM_ENABLED == 1
 std::ostream& operator<<(std::ostream& os, const Version& v) {
   os << v.major << "." << v.minor << "." << v.revision;
-  if (v.addInfo != nullptr) {
+  if (v.addInfo != nullptr and std::strcmp(v.addInfo, "") != 0) {
     os << "-" << v.addInfo;
   }
   return os;