The 13-blink pattern on a US-48-500 (a Unifi Switch) generally indicates a boot or firmware issue. Here are some steps to troubleshoot and potentially resolve this problem:
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### 1. **Power Cycle the Switch**
- Disconnect the power cord or PoE source.
- Wait about 30 seconds and reconnect it.
- Observe the LED behavior during startup.
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### 2. **Check the Power Source**
- Ensure that the switch is receiving stable power, either through its power adapter or PoE injector.
- If using PoE, verify the injector or connected device (like another switch) is functioning correctly.
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### 3. **Inspect the Ethernet Ports**
- If you have devices connected to the switch, disconnect them temporarily.
- Restart the switch with no devices connected to isolate the issue.
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### 4. **Firmware Recovery Mode**
- The 13 blinks could indicate the switch is stuck in a boot loop or recovery mode. You can try manually recovering the firmware:
1. **Download the Firmware**: Visit [Ubiquiti’s firmware page](https://ui.com/download/unifi) and download the appropriate firmware for the US-48-500.
2. **Setup a TFTP Server**: Install a TFTP server (like [TFTPD32](http://tftpd32.jounin.net/)).
3. **Assign Static IP**: Assign your computer an IP in the range `192.168.1.x` (e.g., `192.168.1.25`).
4. **Rename Firmware File**: Rename the firmware file to `firmware.bin` or as directed in the recovery instructions.
5. **Enter Recovery Mode**:
- Connect the switch directly to your computer.
- Power on the switch while holding the reset button for ~10 seconds until the LED pattern changes.
6. **Upload Firmware**: Use the TFTP server to push the firmware to the switch.
7. **Reboot**: Once the upload completes, restart the switch.
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### 5. **Hard Reset**
- Locate the reset button on the switch.
- Hold it down for at least 30 seconds while the switch is powered on.
- Release and let the switch attempt to boot.
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### 6. **Inspect Logs via Console**
- If you have access to a console cable, connect it to the switch and use a terminal program (e.g., PuTTY) to monitor the boot sequence for errors.
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### 7. **Contact Ubiquiti Support**
- If these steps don’t resolve the issue, the switch might have a hardware fault or corruption requiring RMA or professional repair.
- Open a ticket with Ubiquiti support and provide details about the LED sequence and troubleshooting steps you've already taken.
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