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Unlike previous Raspberry Pi models, the Raspberry Pi 4B uses a program built into the EEPROM for booting.
This means that the boot code can be made more flexible and has network boot and USB boot capabilities.
When the bootloader detects a valid start.elf file on the SD card, the ACT LED will flash 4 times.
If the Raspberry Pi fails to start, the onboard LED will flash according to a preset pattern to remind us of the cause of the failure.
The LED will start flashing briefly after N long lights (0 or more). Typically, the blinking pattern repeats again two seconds after the blinking cycle is complete.
The following table lists the regular interpretation of the indicator light flashing.
Long light Short flash Indicated status
0 3 generally refers to startup failure
0 4 start*.elf file not found
0 7 Kernel image file not found
0 8 SDRAM memory failure
0 9 Insufficient SDRAM memory
0 10 in HALT state
2 1 The partition is not in FAT format
2 2 Unable to read partition
2 3 Extended partition is not in FAT format
2 4 File signature/hash mismatch – Pi 4
4 4 Unsupported motherboard models
4 of 5 fatal firmware errors
4 6 Type A power failure
4 7 Type B power failure
Example:
If the ACT LED briefly flashes 4 times, the bootloader (start.elf) cannot be found.
If the ACT LED flashes irregularly, the system has started to boot.
If the ACT LED is not flashing, the EEPROM may be damaged. At this time, you may need to unplug all devices and try again. Unlike previous Raspberry Pi models, Raspberry Pi 4B uses a program built into the EEPROM for booting.
This means that the boot code can be made more flexible and has network boot and USB boot capabilities.
When the bootloader detects a valid start.elf file on the SD card, the ACT LED will flash 4 times.
If the Raspberry Pi fails to start, the onboard LED will flash according to a preset pattern to remind us of the cause of the failure.
The LED will start flashing briefly after N long lights (0 or more). Typically, the blinking pattern repeats again two seconds after the blinking cycle is complete.
The following table lists the regular interpretation of the indicator light flashing.
Long light Short flash Indicated status
0 3 generally refers to startup failure
0 4 start*.elf file not found
0 7 Kernel image file not found
0 8 SDRAM memory failure
0 9 Insufficient SDRAM memory
0 10 in HALT state
2 1 The partition is not in FAT format
2 2 Unable to read partition
2 3 Extended partition is not in FAT format
2 4 File signature/hash mismatch – Pi 4
4 4 Unsupported motherboard models
4 of 5 fatal firmware errors
4 6 Type A power failure
4 7 Type B power failure
Example:
If the ACT LED briefly flashes 4 times, the bootloader (start.elf) cannot be found.
If the ACT LED flashes irregularly, the system has started to boot.
If the ACT LED is not flashing, the EEPROM may be damaged. At this time, you may need to unplug all devices and try again. Unlike previous Raspberry Pi models, Raspberry Pi 4B uses a program built into the EEPROM for booting.
This means that the boot code can be made more flexible and has network boot and USB boot capabilities.
When the bootloader detects a valid start.elf file on the SD card, the ACT LED will flash 4 times.
If the Raspberry Pi fails to start, the onboard LED will flash according to a preset pattern to remind us of the cause of the failure.
The LED will start flashing briefly after N long lights (0 or more). Typically, the blinking pattern repeats again two seconds after the blinking cycle is complete.
The following table lists the regular interpretation of the indicator light flashing.
Long light Short flash Indicated status
0 3 generally refers to startup failure
0 4 start*.elf file not found
0 7 Kernel image file not found
0 8 SDRAM memory failure
0 9 Insufficient SDRAM memory
0 10 in HALT state
2 1 The partition is not in FAT format
2 2 Unable to read partition
2 3 Extended partition is not in FAT format
2 4 File signature/hash mismatch – Pi 4
4 4 Unsupported motherboard models
4 of 5 fatal firmware errors
4 6 Type A power failure
4 7 Type B power failure
Example:
If the ACT LED briefly flashes 4 times, the bootloader (start.elf) cannot be found.
If the ACT LED flashes irregularly, the system has started to boot.
If the ACT LED is not flashing, the EEPROM may be damaged. You may need to unplug all devices and try again
This means that the boot code can be made more flexible and has network boot and USB boot capabilities.
When the bootloader detects a valid start.elf file on the SD card, the ACT LED will flash 4 times.
If the Raspberry Pi fails to start, the onboard LED will flash according to a preset pattern to remind us of the cause of the failure.
The LED will start flashing briefly after N long lights (0 or more). Typically, the blinking pattern repeats again two seconds after the blinking cycle is complete.
The following table lists the regular interpretation of the indicator light flashing.
Long light Short flash Indicated status
0 3 generally refers to startup failure
0 4 start*.elf file not found
0 7 Kernel image file not found
0 8 SDRAM memory failure
0 9 Insufficient SDRAM memory
0 10 in HALT state
2 1 The partition is not in FAT format
2 2 Unable to read partition
2 3 Extended partition is not in FAT format
2 4 File signature/hash mismatch – Pi 4
4 4 Unsupported motherboard models
4 of 5 fatal firmware errors
4 6 Type A power failure
4 7 Type B power failure
Example:
If the ACT LED briefly flashes 4 times, the bootloader (start.elf) cannot be found.
If the ACT LED flashes irregularly, the system has started to boot.
If the ACT LED is not flashing, the EEPROM may be damaged. At this time, you may need to unplug all devices and try again. Unlike previous Raspberry Pi models, Raspberry Pi 4B uses a program built into the EEPROM for booting.
This means that the boot code can be made more flexible and has network boot and USB boot capabilities.
When the bootloader detects a valid start.elf file on the SD card, the ACT LED will flash 4 times.
If the Raspberry Pi fails to start, the onboard LED will flash according to a preset pattern to remind us of the cause of the failure.
The LED will start flashing briefly after N long lights (0 or more). Typically, the blinking pattern repeats again two seconds after the blinking cycle is complete.
The following table lists the regular interpretation of the indicator light flashing.
Long light Short flash Indicated status
0 3 generally refers to startup failure
0 4 start*.elf file not found
0 7 Kernel image file not found
0 8 SDRAM memory failure
0 9 Insufficient SDRAM memory
0 10 in HALT state
2 1 The partition is not in FAT format
2 2 Unable to read partition
2 3 Extended partition is not in FAT format
2 4 File signature/hash mismatch – Pi 4
4 4 Unsupported motherboard models
4 of 5 fatal firmware errors
4 6 Type A power failure
4 7 Type B power failure
Example:
If the ACT LED briefly flashes 4 times, the bootloader (start.elf) cannot be found.
If the ACT LED flashes irregularly, the system has started to boot.
If the ACT LED is not flashing, the EEPROM may be damaged. At this time, you may need to unplug all devices and try again. Unlike previous Raspberry Pi models, Raspberry Pi 4B uses a program built into the EEPROM for booting.
This means that the boot code can be made more flexible and has network boot and USB boot capabilities.
When the bootloader detects a valid start.elf file on the SD card, the ACT LED will flash 4 times.
If the Raspberry Pi fails to start, the onboard LED will flash according to a preset pattern to remind us of the cause of the failure.
The LED will start flashing briefly after N long lights (0 or more). Typically, the blinking pattern repeats again two seconds after the blinking cycle is complete.
The following table lists the regular interpretation of the indicator light flashing.
Long light Short flash Indicated status
0 3 generally refers to startup failure
0 4 start*.elf file not found
0 7 Kernel image file not found
0 8 SDRAM memory failure
0 9 Insufficient SDRAM memory
0 10 in HALT state
2 1 The partition is not in FAT format
2 2 Unable to read partition
2 3 Extended partition is not in FAT format
2 4 File signature/hash mismatch – Pi 4
4 4 Unsupported motherboard models
4 of 5 fatal firmware errors
4 6 Type A power failure
4 7 Type B power failure
Example:
If the ACT LED briefly flashes 4 times, the bootloader (start.elf) cannot be found.
If the ACT LED flashes irregularly, the system has started to boot.
If the ACT LED is not flashing, the EEPROM may be damaged. You may need to unplug all devices and try again
