====== APU2 Board lost settings ======
My current firewall stopped working, so I took my old and outdated APU2 firewall out of retirement. Here are the steps to get it back to work.
  - My old APU2 has only 3 NICs. I plugged in a USB2 to RJ45 NIC which now provides the 4<sup>th</sup> NIC.
  - Since the Endian Firewall (EFW) versions are different I could not utilitze a current backup
  - I connected the APU2 with a USB to serial cable to my computer, opened PuTTY and booted the device
    * Grub will boot with Baud rate 115200, set PuTTY accordingly
    * Once EFW is running change PuTTY to Baud rate 38400
  - Login via Shell and run netwizard. You will see which interface the board listens to (green), either use that one or change the interface settings.
  - Connect your PC with static interface in the same subnet to the green interface of APU2
  - Download and install the [[https://www.palemoon.org/|Pale Moon]] browser. This is the only browser which allows to connect to TLS 1.0 and TLS 1.1, Chrome and all others block access to those protocols due to security risks. 
  - Note that EFW version 3.0 was the last 32 Bit version, and APU2 has a 32 Bit CPU. EFW 3.0 goes back to the beginning of 2014. It is recommendable to use this version of EFW as a fall back only until you have built or bought a replacement for your broken firewall.
  - Connect to the EFW web interface with Pale Moon and complete the setup.
  - The SSD from my broken firewall is still accessible, so I copied all dnsmasq config files over to my APU2 which allowed a quick setup of the [[efw:efwdhcp|DHCP server]].