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34 lines
1.3 KiB
Plaintext
34 lines
1.3 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 3.0 (VL805) firmware to the latest
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version (138a1) with better full-speed isochronous endpoint support.
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The easiest method for creating EEPROM rescue images, and formatting SD cards,
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is to use Raspberry Pi Imager from https://raspberrypi.com/software.
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Imager provides a GUI for downloading the latest version of this rescue
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image and flashing it to an 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 an SD card containing the files from this zip file
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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 pattern
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corresponding to the specific error.
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If an HDMI display is attached, then the screen will display green for success
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or red if a failure occurs.
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Once the EEPROM is updated, the SD card can be removed.
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