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Previously, the .sig would have an update timestamp of zero. Switching to rpi-eeprom-digest is preferable because the update timestamp will be much closer to when the image was installed. N.B. Update-timestamp is used to track configuration changes and is independent of the build-timestamps which are the version of the bootloader executable.
Raspberry Pi 4 EEPROM bootloader rescue image ********************************************* The Raspberry Pi 4 contains a small EEPROM used to store the bootloader. This rescue image reverts the bootloader EEPROM to factory default settings. This rescue image also updates the USB 3 controller (VL805) firmware to the latest version, 138a1, which has better full-speed isochronous endpoint support. Raspberry Pi 4 board revisions 1.1 and 1.2 contain a separate EEPROM which contains firmware for the USB 3 controller (VL805): on newer revisions the USB controller firmware is stored in the bootloader EEPROM along with the bootloader. The easiest method for creating EEPROM rescue images, and formatting SD cards, is to use Raspberry Pi Imager from https://raspberrypi.com/software. Raspberry Pi Imager provides a GUI for downloading the latest version of this rescue image and flashing it to a spare SD card. Alternatively, copy the contents of this zip file to a blank FAT formatted SD card. The FAT partition must be < 32 GB. To update the EEPROM: 1. Power off the Raspberry Pi 2. Insert the bootloader update SD card 3. Power on the Raspberry Pi 4. Wait at least 10 seconds If successful, the green LED on the Raspberry Pi will blink rapidly forever. An unsuccessful update of the EEPROM is indicated by a different blinking pattern corresponding to the specific error. If an HDMI display is attached, then the screen will display green for success or red if a failure occurs. Once the EEPROM is updated, the SD card can be removed. In order to make the entire capacity of the SD card available again, you must then reformat the SD card using Raspberry Pi Imager by selecting the 'format card as FAT32' option.