diff --git a/firmware/beta/pieeprom-2021-10-27.bin b/firmware/beta/pieeprom-2021-10-27.bin
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diff --git a/firmware/beta/recovery.bin b/firmware/beta/recovery.bin
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diff --git a/firmware/release-notes.md b/firmware/release-notes.md
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--- a/firmware/release-notes.md
+++ b/firmware/release-notes.md
@@ -3,6 +3,15 @@
 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
 
+## 2021-10-27 - Secure boot improvements - BETA
+  * Improve the error logging if a file is too large and truncated.
+  * Increase the maximum size of the ramdisk to 96MB.
+  * Preliminary changes to expose the boot-mode used to load the ramdisk via device-tree.
+
+  N.B. Secure boot is only recommended for industrial customers and is currently
+  a beta release. This can only be enabled via RPIBOOT
+  https://github.com/raspberrypi/usbboot/blob/master/Readme.md
+
 ## 2021-10-05 - Update for latest Broadcom SDRAM settings - BETA
   * Minor update for latest SDRAM tuning settings.