diff --git a/test/functional/api/cas/cli.py b/test/functional/api/cas/cli.py
index 106a7ca..b003eb3 100644
--- a/test/functional/api/cas/cli.py
+++ b/test/functional/api/cas/cli.py
@@ -1,5 +1,5 @@
 #
-# Copyright(c) 2019-2021 Intel Corporation
+# Copyright(c) 2019-2022 Intel Corporation
 # SPDX-License-Identifier: BSD-3-Clause
 #
 
@@ -85,8 +85,8 @@ def flush_cache_cmd(cache_id: str, shortcut: bool = False):
 
 
 def flush_core_cmd(cache_id: str, core_id: str, shortcut: bool = False):
-    command = (f" -E -i {cache_id} -j {core_id}" if shortcut
-               else f" --flush-core --cache-id {cache_id} --core-id {core_id}")
+    command = (f" -F -i {cache_id} -j {core_id}" if shortcut
+               else f" --flush-cache --cache-id {cache_id} --core-id {core_id}")
     return casadm_bin + command
 
 
diff --git a/test/functional/api/cas/cli_help_messages.py b/test/functional/api/cas/cli_help_messages.py
index dfe36f6..a1a404e 100644
--- a/test/functional/api/cas/cli_help_messages.py
+++ b/test/functional/api/cas/cli_help_messages.py
@@ -20,8 +20,6 @@ casadm_help = [
     r"-P  --stats                    Print statistics for cache instance",
     r"-Z  --reset-counters           Reset cache statistics for core device within cache instance",
     r"-F  --flush-cache              Flush all dirty data from the caching device to core devices",
-    r"-E  --flush-core               Flush dirty data of a given core from the caching device "
-    r"to this core device",
     r"-C  --io-class                 Manage IO classes",
     r"-V  --version                  Print CAS version",
     r"-H  --help                     Print help",
@@ -61,20 +59,14 @@ ioclass_help = [
     r"-o  --output-format \<FORMAT\>        Output format: \{table|csv\}"
 ]
 
-flush_core_help = [
-    r"Usage: casadm --flush-core --cache-id \<ID\> --core-id \<ID\>",
-    r"Flush dirty data of a given core from the caching device to this core device",
-    r"Options that are valid with --flush-core \(-E\) are:",
-    r"-i  --cache-id \<ID\>                 Identifier of cache instance \<1-16384\>",
-    r"-j  --core-id \<ID\>                  Identifier of core \<0-4095\> within given cache "
-    r"instance"
-]
-
 flush_cache_help = [
     r"Usage: casadm --flush-cache --cache-id \<ID\>",
     r"Flush all dirty data from the caching device to core devices",
     r"Options that are valid with --flush-cache \(-F\) are:",
     r"-i  --cache-id \<ID\>                 Identifier of cache instance \<1-16384\>"
+    r"-j  --core-id \<ID\>                  Identifier of core \<0-4095\> within given cache "
+    r"instance. This is an optional parameter When provided, it will flush core with provided"
+    r" id connected to cache. In other case it will flush cache."
 ]
 
 reset_counters_help = [
diff --git a/test/functional/tests/cli/test_cli_help_and_version.py b/test/functional/tests/cli/test_cli_help_and_version.py
index 8f9436f..7c2cae8 100644
--- a/test/functional/tests/cli/test_cli_help_and_version.py
+++ b/test/functional/tests/cli/test_cli_help_and_version.py
@@ -74,10 +74,6 @@ def test_cli_help(shortcut):
                                   + (" -H" if shortcut else " --help"))
     check_stdout_msg(output, flush_cache_help)
 
-    output = TestRun.executor.run("casadm" + (" -E" if shortcut else " --flush-core")
-                                  + (" -H" if shortcut else " --help"))
-    check_stdout_msg(output, flush_core_help)
-
     output = TestRun.executor.run("casadm" + (" -C" if shortcut else " --io-class")
                                   + (" -H" if shortcut else " --help"))
     check_stdout_msg(output, ioclass_help)
diff --git a/test/smoke_test/cas_functions b/test/smoke_test/cas_functions
index d4f71b5..558a7ec 100644
--- a/test/smoke_test/cas_functions
+++ b/test/smoke_test/cas_functions
@@ -1,7 +1,7 @@
 #!/bin/bash
 
 #
-# Copyright(c) 2012-2021 Intel Corporation
+# Copyright(c) 2012-2022 Intel Corporation
 # SPDX-License-Identifier: BSD-3-Clause
 #
 
@@ -530,7 +530,7 @@ flush_cache() {
 flush_core() {
     check_options ${FUNCNAME[0]}
 
-    local COMMAND="$CAS --flush-core --cache-id $CACHE_ID_OPTION --core-id $CORE_ID_OPTION"
+    local COMMAND="$CAS --flush-cache --cache-id $CACHE_ID_OPTION --core-id $CORE_ID_OPTION"
 
     run_cmd $COMMAND
     clear_options