diff --git a/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC55S69/TARGET_M33_NS/prebuilt/README.md b/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC55S69/TARGET_M33_NS/prebuilt/README.md
index 19a78be306..fc1711088f 100644
--- a/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC55S69/TARGET_M33_NS/prebuilt/README.md
+++ b/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC55S69/TARGET_M33_NS/prebuilt/README.md
@@ -9,25 +9,31 @@ These images were compiled by the following command:
 ## tfm.bin
 
 ```sh
-mbed compile -t ARMC6 -m LPC55S69_S --app-config tools/psa/tfm/mbed_app.json --profile release
+mbed compile -t ARMC6 -m LPC55S69_S --app-config mbed-os/tools/psa/tfm/mbed_app.json --profile release
 ```
 
 ## spm_smoke.bin
 
 ```sh
-mbed test --compile -t ARMC6 -m LPC55S69_S --app-config tools/psa/tfm/mbed_app.json -n tests-psa-spm_smoke -DUSE_PSA_TEST_PARTITIONS -DUSE_SMOKE_TESTS_PART1 --profile release
+mbed test --compile -t ARMC6 -m LPC55S69_S --app-config mbed-os/tools/psa/tfm/mbed_app.json -n mbed-os-tests-psa-spm_smoke -DUSE_PSA_TEST_PARTITIONS -DUSE_SMOKE_TESTS_PART1 --profile release
 ```
 
 ## spm_client.bin
 
 ```sh
-mbed test --compile -t ARMC6 -m LPC55S69_S --app-config tools/psa/tfm/mbed_app.json -n tests-psa-spm_client -DUSE_PSA_TEST_PARTITIONS -DUSE_CLIENT_TESTS_PART1 --profile release
+mbed test --compile -t ARMC6 -m LPC55S69_S --app-config mbed-os/tools/psa/tfm/mbed_app.json -n mbed-os-tests-psa-spm_client -DUSE_PSA_TEST_PARTITIONS -DUSE_CLIENT_TESTS_PART1 --profile release
 ```
 
 ## spm_server.bin
 
 ```sh
-mbed test --compile -t ARMC6 -m LPC55S69_S --app-config tools/psa/tfm/mbed_app.json -n tests-psa-spm_server -DUSE_PSA_TEST_PARTITIONS -DUSE_SERVER_TESTS_PART1 -DUSE_SERVER_TESTS_PART2 --profile release
+mbed test --compile -t ARMC6 -m LPC55S69_S --app-config mbed-os/tools/psa/tfm/mbed_app.json -n mbed-os-tests-psa-spm_server -DUSE_PSA_TEST_PARTITIONS -DUSE_SERVER_TESTS_PART1 -DUSE_SERVER_TESTS_PART2 --profile release
+```
+
+## crypto_access_control.bin
+
+```sh
+mbed test --compile -t ARMC6 -m LPC55S69_S --app-config mbed-os/tools/psa/tfm/mbed_app.json -n mbed-os-tests-psa-crypto_access_control -DUSE_PSA_TEST_PARTITIONS -DUSE_CRYPTO_ACL_TEST --profile release
 ```
 
 To update the prebuilt binaries run the previous commands.
diff --git a/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC55S69/TARGET_M33_NS/prebuilt/crypto_access_control.bin b/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC55S69/TARGET_M33_NS/prebuilt/crypto_access_control.bin
new file mode 100644
index 0000000000..6b8607378f
Binary files /dev/null and b/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC55S69/TARGET_M33_NS/prebuilt/crypto_access_control.bin differ
diff --git a/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC55S69/TARGET_M33_NS/prebuilt/spm_client.bin b/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC55S69/TARGET_M33_NS/prebuilt/spm_client.bin
index f46f604f98..e6bbb75a75 100644
Binary files a/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC55S69/TARGET_M33_NS/prebuilt/spm_client.bin and b/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC55S69/TARGET_M33_NS/prebuilt/spm_client.bin differ
diff --git a/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC55S69/TARGET_M33_NS/prebuilt/spm_server.bin b/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC55S69/TARGET_M33_NS/prebuilt/spm_server.bin
index 3bffb7f914..048aa4af66 100644
Binary files a/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC55S69/TARGET_M33_NS/prebuilt/spm_server.bin and b/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC55S69/TARGET_M33_NS/prebuilt/spm_server.bin differ
diff --git a/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC55S69/TARGET_M33_NS/prebuilt/spm_smoke.bin b/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC55S69/TARGET_M33_NS/prebuilt/spm_smoke.bin
index 969cc1b7c5..dd0f38be65 100644
Binary files a/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC55S69/TARGET_M33_NS/prebuilt/spm_smoke.bin and b/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC55S69/TARGET_M33_NS/prebuilt/spm_smoke.bin differ
diff --git a/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC55S69/TARGET_M33_NS/prebuilt/tfm.bin b/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC55S69/TARGET_M33_NS/prebuilt/tfm.bin
index f9fc96255b..a21d55edcb 100644
Binary files a/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC55S69/TARGET_M33_NS/prebuilt/tfm.bin and b/targets/TARGET_NXP/TARGET_MCUXpresso_MCUS/TARGET_LPC55S69/TARGET_M33_NS/prebuilt/tfm.bin differ
diff --git a/targets/targets.json b/targets/targets.json
index 5ef84f5021..33a0bace94 100644
--- a/targets/targets.json
+++ b/targets/targets.json
@@ -2100,7 +2100,8 @@
             "secure-rom-size": "0x30000",
             "secure-ram-start": "0x30000000",
             "secure-ram-size": "0x22000"
-        }
+        },
+        "OUTPUT_EXT": "hex"
     },
     "LPC55S69_S": {
         "inherits": ["SPE_Target", "LPC55S69"],
diff --git a/tools/targets/LPC55S69.py b/tools/targets/LPC55S69.py
index a1bb4f4827..e003d910aa 100644
--- a/tools/targets/LPC55S69.py
+++ b/tools/targets/LPC55S69.py
@@ -15,34 +15,23 @@
  #
 
 import os
-from os.path import abspath, basename, dirname, splitext
+from os.path import abspath, dirname
 from os.path import join as path_join
-import tempfile
 
-from tools.psa.tfm.bin_utils.assemble import Assembly
+from intelhex import IntelHex
 
 SCRIPT_DIR = dirname(abspath(__file__))
 MBED_OS_ROOT = abspath(path_join(SCRIPT_DIR, os.pardir, os.pardir))
 LPC55S69_BASE = path_join(MBED_OS_ROOT, 'targets', 'TARGET_NXP', 'TARGET_MCUXpresso_MCUS', 'TARGET_LPC55S69')
 
-def lpc55s69_tfm_bin(t_self, non_secure_bin, secure_bin):
-    tempdir = tempfile.mkdtemp()
-    flash_layout = path_join(LPC55S69_BASE, 'partition', 'flash_layout.h')
-    ns_bin_name, ns_bin_ext = splitext(basename(non_secure_bin))
-    concatenated_bin = path_join(tempdir, 'tfm_' + ns_bin_name + ns_bin_ext)
 
-    assert os.path.isfile(flash_layout)
+def lpc55s69_complete(t_self, non_secure_bin, secure_bin):
     assert os.path.isfile(secure_bin)
     assert os.path.isfile(non_secure_bin)
 
-    #1. Concatenate secure TFM and non-secure mbed binaries
-    output = Assembly(flash_layout, concatenated_bin)
-    output.add_image(secure_bin, "SECURE")
-    output.add_image(non_secure_bin, "NON_SECURE")
-
-    #2. Delete the original binary file name
-    os.remove(non_secure_bin)
-
-    #3. Rename to new concatenated binary to the original binary file name
-    os.rename(concatenated_bin, non_secure_bin)
+    ns_hex = IntelHex(non_secure_bin)
+    s_hex = IntelHex()
+    s_hex.loadbin(secure_bin)
 
+    s_hex.merge(ns_hex, overlap='ignore')
+    s_hex.tofile(non_secure_bin, 'hex')
diff --git a/tools/targets/__init__.py b/tools/targets/__init__.py
index 717c703f32..b122ef1adb 100644
--- a/tools/targets/__init__.py
+++ b/tools/targets/__init__.py
@@ -603,10 +603,10 @@ class LPC55S69Code:
     """LPC55S69 Hooks"""
     @staticmethod
     def binary_hook(t_self, resources, elf, binf):
-        from tools.targets.LPC55S69 import lpc55s69_tfm_bin
+        from tools.targets.LPC55S69 import lpc55s69_complete
         configured_secure_image_filename = t_self.target.secure_image_filename
         secure_bin = find_secure_image(t_self.notify, resources, binf, configured_secure_image_filename, FileType.BIN)
-        lpc55s69_tfm_bin(t_self, binf, secure_bin)
+        lpc55s69_complete(t_self, binf, secure_bin)
 
 ################################################################################