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