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@ -15,6 +15,48 @@ feed_exclude: true
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## Activity LED codes
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### Up to Raspberry Pi 3 models
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#### Actual models
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| LED Activity | Description |
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|:------------------|:------------------------------------|
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| 3 flashes | start.elf not found |
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| 4 flashes | start.elf not launch-able (corrupt) |
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| 7 flashes | kernel.img not found |
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| 8 flashes | SDRAM not recognized. You need a newer bootcode.bin/start.elf firmware, or your SDRAM is damaged |
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#### Older models up to Raspberry Pi 3
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| LED Activity | Description |
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|:------------------|:-------------------------------------|
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| 3 flashes | loader.bin not found |
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| 4 flashes | loader.bin not launch-able (corrupt) |
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| 5 flashes | start.elf not found |
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| 6 flashes | start.elf not launch-able |
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| 7 flashes | kernel.img not found |
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### Raspberry Pi 4
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| Long flashes | Short flashes | Description |
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|:-------------|:--------------|:------------------------------------|
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| 0 | 3 | Generic failure to boot |
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| 0 | 4 | start*.elf not found |
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| 0 | 7 | Kernel image not found |
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| 0 | 8 | SDRAM failure |
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| 0 | 9 | Insufficient SDRAM |
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| 0 | 10 | In HALT state |
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| 2 | 1 | Partition not FAT |
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| 2 | 2 | Failed to read from partition |
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| 2 | 3 | Extended partition not FAT |
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| 2 | 4 | File signature/hash mismatch - Pi 4 |
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| 4 | 4 | Unsupported board type |
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| 4 | 5 | Fatal firmware error |
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| 4 | 6 | Power failure type A |
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| 4 | 7 | Power failure type B |
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## Freeze a package with apt/apt-get
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<https://askubuntu.com/a/18656>
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