diff --git a/debian/changelog b/debian/changelog
index 3d466ab..b87645c 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,12 @@
+rpi-eeprom (12.3-1) buster; urgency=medium
+
+  [ Tim Gover ]
+  * pieeprom-2021-04-29.bin - Pi400 MII clock freq - STABLE
+  * pieeprom-2021-04-29: Update default release to this image
+  * Update imager-release to 2021-04-29
+
+ -- Serge Schneider <serge@raspberrypi.com>  Fri, 30 Apr 2021 12:57:28 +0100
+
 rpi-eeprom (12.2-1) buster; urgency=medium
 
   [ Tim Gover ]
diff --git a/firmware/critical/pieeprom-2021-04-29.bin b/firmware/critical/pieeprom-2021-04-29.bin
new file mode 100644
index 0000000..e386747
Binary files /dev/null and b/firmware/critical/pieeprom-2021-04-29.bin differ
diff --git a/firmware/release-notes.md b/firmware/release-notes.md
index d1f940f..5189c4a 100644
--- a/firmware/release-notes.md
+++ b/firmware/release-notes.md
@@ -3,8 +3,13 @@
 USB MSD boot also requires the firmware from Raspberry Pi OS 2020-08-20 or newer.
 https://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2711_bootloader_config.md
 
+## 2021-04-30 - Update default version to 2021-04-29
+   * The manufacturing release has been updated to pieeprom-2021-04-29 so update the default release to match this.
+
+## 2021-04-29 - Pi400 - Reduce MII clock freq when probing ethernet PHY - STABLE
+   * Pi400 - Reduce MII clock freq when probing ethernet PHY - STABLE
+
 ## 2021-04-19 - Promote 2021-03-18 from LATEST to DEFAULT - DEFAULT
-   Interesting changes since the last default release:-
    * Display VC_BUILD_ID strings instead of the SHA256 hash
    * Add support for [cm4] and [pi400] config conditionals filters.
    * Change network boot to use the same "RXID" Ethernet PHY configuration as the 5.10 kernel
diff --git a/firmware/stable/pieeprom-2021-04-29.bin b/firmware/stable/pieeprom-2021-04-29.bin
new file mode 100644
index 0000000..e386747
Binary files /dev/null and b/firmware/stable/pieeprom-2021-04-29.bin differ
diff --git a/imager/make-imager-release b/imager/make-imager-release
index 45ea308..73c24ba 100755
--- a/imager/make-imager-release
+++ b/imager/make-imager-release
@@ -4,4 +4,4 @@ set -e
 
 script_dir=$(cd "$(dirname "$0")" && pwd)
 
-${script_dir}/make-release critical 2021-03-18 000138a1 "${script_dir}" release rpi-boot-eeprom-recovery
+${script_dir}/make-release critical 2021-04-29 000138a1 "${script_dir}" release rpi-boot-eeprom-recovery