diff --git a/meta-digi-arm/dynamic-layers/stm-st-stm32mp/recipes-bsp/trusted-firmware-m/tf-m-stm32mp_2.1.bbappend b/meta-digi-arm/dynamic-layers/stm-st-stm32mp/recipes-bsp/trusted-firmware-m/tf-m-stm32mp_2.1.bbappend
new file mode 100644
index 000000000..bdc2b1650
--- /dev/null
+++ b/meta-digi-arm/dynamic-layers/stm-st-stm32mp/recipes-bsp/trusted-firmware-m/tf-m-stm32mp_2.1.bbappend
@@ -0,0 +1,6 @@
+#
+# Copyright (C) 2026, Digi International Inc.
+#
+
+# Inherit custom DIGI sign class to skip signing tool and key parsing restrictions
+inherit sign-stm32mp-digi
diff --git a/meta-digi-arm/dynamic-layers/stm-st-stm32mp/recipes-extended/stm32mp2projects/m33fw-stm32mp2.bbappend b/meta-digi-arm/dynamic-layers/stm-st-stm32mp/recipes-extended/stm32mp2projects/m33fw-stm32mp2.bbappend
new file mode 100644
index 000000000..bdc2b1650
--- /dev/null
+++ b/meta-digi-arm/dynamic-layers/stm-st-stm32mp/recipes-extended/stm32mp2projects/m33fw-stm32mp2.bbappend
@@ -0,0 +1,6 @@
+#
+# Copyright (C) 2026, Digi International Inc.
+#
+
+# Inherit custom DIGI sign class to skip signing tool and key parsing restrictions
+inherit sign-stm32mp-digi