diff --git a/Cargo.lock b/Cargo.lock
index 201b39c5..38a982d7 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -666,7 +666,7 @@ dependencies = [
 
 [[package]]
 name = "backend"
-version = "4.3.0-test.2"
+version = "4.3.0-test.3"
 dependencies = [
  "aes-kw",
  "anyhow",
@@ -880,7 +880,7 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
 [[package]]
 name = "chirpstack"
-version = "4.3.0-test.2"
+version = "4.3.0-test.3"
 dependencies = [
  "aes",
  "anyhow",
@@ -959,7 +959,7 @@ dependencies = [
 
 [[package]]
 name = "chirpstack_api"
-version = "4.3.0-test.2"
+version = "4.3.0-test.3"
 dependencies = [
  "hex",
  "pbjson",
@@ -2367,7 +2367,7 @@ dependencies = [
 
 [[package]]
 name = "lrwn"
-version = "4.3.0-test.2"
+version = "4.3.0-test.3"
 dependencies = [
  "aes",
  "anyhow",
diff --git a/api/grpc-web/package.json b/api/grpc-web/package.json
index 54baa7c8..7c2a649f 100644
--- a/api/grpc-web/package.json
+++ b/api/grpc-web/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@chirpstack/chirpstack-api-grpc-web",
-  "version": "4.3.0-test.2",
+  "version": "4.3.0-test.3",
   "description": "Chirpstack gRPC-web API",
   "license": "MIT",
   "devDependencies": {
diff --git a/api/java/build.gradle.kts b/api/java/build.gradle.kts
index 1bddde17..039d999b 100644
--- a/api/java/build.gradle.kts
+++ b/api/java/build.gradle.kts
@@ -8,7 +8,7 @@ plugins {
 }
 
 group = "io.chirpstack"
-version = "4.3.0-test.2"
+version = "4.3.0-test.3"
 
 repositories {
     mavenCentral()
diff --git a/api/js/package.json b/api/js/package.json
index f9faf319..8157c54a 100644
--- a/api/js/package.json
+++ b/api/js/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@chirpstack/chirpstack-api",
-  "version": "4.3.0-test.2",
+  "version": "4.3.0-test.3",
   "description": "Chirpstack JS and TS API",
   "license": "MIT",
   "devDependencies": {
diff --git a/api/kotlin/build.gradle.kts b/api/kotlin/build.gradle.kts
index 00735ea9..c136a75f 100644
--- a/api/kotlin/build.gradle.kts
+++ b/api/kotlin/build.gradle.kts
@@ -9,7 +9,7 @@ plugins {
 }
 
 group = "io.chirpstack"
-version = "4.3.0-test.2"
+version = "4.3.0-test.3"
 
 repositories {
     mavenCentral()
diff --git a/api/python/proto/chirpstack-api/internal/internal.proto b/api/python/proto/chirpstack-api/internal/internal.proto
index 2d42f4ec..a136e4af 100644
--- a/api/python/proto/chirpstack-api/internal/internal.proto
+++ b/api/python/proto/chirpstack-api/internal/internal.proto
@@ -229,8 +229,11 @@ message DownlinkFrame {
     // Encrypted FOpts (LoRaWAN 1.1).
     bool encrypted_fopts = 8;
 
-    // Network session encryption key (for FOpts).
+    // Network session encryption key (for FOpts and FRMPayload mac-commands).
     bytes nwk_s_enc_key = 9;
+
+    // NFCntDown (for decrypting mac-commands).
+    uint32 n_f_cnt_down = 10;
 }
 
 message LoraCloudGeolocBuffer {
diff --git a/api/python/src/setup.py b/api/python/src/setup.py
index 3a7bde91..6ff16fed 100644
--- a/api/python/src/setup.py
+++ b/api/python/src/setup.py
@@ -18,7 +18,7 @@ CLASSIFIERS = [
 
 setup(
     name='chirpstack-api',
-    version = "4.3.0-test.2",
+    version = "4.3.0-test.3",
     url='https://github.com/brocaar/chirpstack-api',
     author='Orne Brocaar',
     author_email='info@brocaar.com',
diff --git a/api/rust/Cargo.lock b/api/rust/Cargo.lock
index 2a65bc44..0e3bbc3a 100644
--- a/api/rust/Cargo.lock
+++ b/api/rust/Cargo.lock
@@ -118,7 +118,7 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
 [[package]]
 name = "chirpstack_api"
-version = "4.3.0-test.2"
+version = "4.3.0-test.3"
 dependencies = [
  "hex",
  "pbjson",
diff --git a/api/rust/Cargo.toml b/api/rust/Cargo.toml
index 26b13679..55c5d6dc 100644
--- a/api/rust/Cargo.toml
+++ b/api/rust/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "chirpstack_api"
 description = "ChirpStack Protobuf / gRPC API definitions."
-version = "4.3.0-test.2"
+version = "4.3.0-test.3"
 authors = ["Orne Brocaar <info@brocaar.com>"]
 license = "MIT"
 homepage = "https://www.chirpstack.io"
diff --git a/backend/Cargo.toml b/backend/Cargo.toml
index 0c62a1fa..00295cf1 100644
--- a/backend/Cargo.toml
+++ b/backend/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "backend"
-version = "4.3.0-test.2"
+version = "4.3.0-test.3"
 authors = ["Orne Brocaar <info@brocaar.com>"]
 edition = "2018"
 publish = false
diff --git a/chirpstack/Cargo.toml b/chirpstack/Cargo.toml
index 6a489080..466c71d7 100644
--- a/chirpstack/Cargo.toml
+++ b/chirpstack/Cargo.toml
@@ -3,7 +3,7 @@ name = "chirpstack"
 description = "ChirpStack is an open-source LoRaWAN(TM) Network Server"
 repository = "https://github.com/chirpstack/chirpstack"
 homepage="https://www.chirpstack.io/"
-version = "4.3.0-test.2"
+version = "4.3.0-test.3"
 authors = ["Orne Brocaar <info@brocaar.com>"]
 edition = "2021"
 publish = false
diff --git a/lrwn/Cargo.toml b/lrwn/Cargo.toml
index 4ba48d22..3c64e643 100644
--- a/lrwn/Cargo.toml
+++ b/lrwn/Cargo.toml
@@ -3,7 +3,7 @@ name = "lrwn"
 description = "Library for encoding / decoding LoRaWAN frames."
 homepage = "https://www.chirpstack.io"
 license = "MIT"
-version = "4.3.0-test.2"
+version = "4.3.0-test.3"
 authors = ["Orne Brocaar <info@brocaar.com>"]
 edition = "2018"
 repository = "https://github.com/chirpstack/chirpstack"
diff --git a/ui/package.json b/ui/package.json
index e4d2ff50..0c8c616a 100644
--- a/ui/package.json
+++ b/ui/package.json
@@ -1,6 +1,6 @@
 {
   "name": "chirpstack-ui",
-  "version": "4.3.0-test.2",
+  "version": "4.3.0-test.3",
   "private": true,
   "dependencies": {
     "@ant-design/colors": "^6.0.0",