From hardware revision R3C the PA1 offers a recovery feature allowing you to flash the device with a new PA1 firmware.

Procedure:
- Isolate the PA1 from your normal network so that it will not try and obtain an IP address via DHCP
- Configure your Laptop or PC with the static IP address 192.168.37.38, with a 24 bit mask of 255.255.255.0. There is no need to configure DNS or a default gateway address.
- Connect your PC to the the same PA1 network
- Make sure the TFTP server is running, listening on port 69 and snomPA1.bin is at the root of the shared TFTP directory.
- Connect the KBD wiring cable to the KBD I/O port of the PA1.
- Shorten pin 0 (blue wire) and pin 1 (white wire) by connecting them together.
- While the pins are shortened, connect the PA1 to the PoE Switch plug the power adapter.
- After some seconds the TFTP transfer will begin. You can disconnect the short after about 20 seconds after the PA1 boots up.
- While the rescue is progressing the following LED control sequence can be observed:
- Contacting TFTP-server and fetching the rescue file: red LED - ON, green LED – ON
- Erasing the flash: red LED - FLASHING (about 1Hz), green LED - FLASHING (about 1Hz)
- Writing to flash: red LED - FLASHING (faster than 1Hz), green LED - FLASHING (faster than 1Hz)
- Rescue successful: red LED - OFF, green LED - ON (stays like that, no reboot)
- Rescue failed (file corrupt or erasing/writing failed): red LED - ON, green LED – OFF
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