Updates docs for firmware changes for CM5 / Pi500 and other recent firmware changes.

documentation/asciidoc/computers/raspberry-pi/boot-eeprom.adoc

@@ -1,6 +1,6 @@
 == Raspberry Pi boot EEPROM
 
-Raspberry Pi 5, Raspberry Pi 4, 400, Compute Module 4, and Compute Module 4S computers use an EEPROM to boot the system. All other models of Raspberry Pi computer use the `bootcode.bin` file located in the boot filesystem.
+Raspberry Pi 5, Compute Module 5, Raspberry Pi 500, Raspberry Pi 4, Raspberry Pi 400, Compute Module 4, and Compute Module 4S computers use an EEPROM to boot the system. All other models of Raspberry Pi computer use the `bootcode.bin` file located in the boot filesystem.
 
 NOTE: You can find the scripts and pre-compiled binaries used to create `rpi-eeprom`  in the https://github.com/raspberrypi/rpi-eeprom/[rpi-eeprom GitHub repository].
 
@@ -13,10 +13,13 @@ If an error occurs during boot, then an xref:configuration.adoc#led-warning-flas
 
 There are multiple ways to update the bootloader of your Raspberry Pi.
 
-==== Raspberry Pi 5, Raspberry Pi 4 and Raspberry Pi 400
+==== Raspberry Pi 5, Compute Module 5, Raspberry Pi 500, Raspberry Pi 4 and Raspberry Pi 400
 
 Raspberry Pi OS automatically updates the bootloader for important bug fixes. To manually update the bootloader or change the boot order, use xref:configuration.adoc#raspi-config[raspi-config].
 
+N.B. On Compute Module 4 and CM4S the bootrom is unable to load the `recovery.bin` file from EMMC and automatic bootloader updates are not enabled.
+The recommended update mechanism is `rpiboot` or via `flashrom` - see `rpi-eeprom-update -h` for more information.
+
 [[imager]]
 ==== Use Raspberry Pi Imager to update the bootloader