NOTE: Do not power off the AP during the loader upgrade process. Wait till it finishes and prompt for reboot button. Powering off the AP during the loader upgrade process may caused the unit to be unusable.

The steps are:
1. Unzip the image file, login to the WP54AG configuration page, go to firmware upgrade menu, and browse for the file: wp54_ldupdate_v242_b0521.img
2. It will show the firmware upgrade is process as how normally firmware upgrade works. Wait till it finishes and ask for reboot.
3. Reboot AP.
4. After reboot, notice the DIAG LED will start blinking fast non-stop. You will need to do a firmware recovery through tftp.
5. First, get ready the latest firmware 3.04 for AG. send ping to 192.168.168.1 to find out if the link is ok. If there is ping reply, proceed with firmware upload through TFTP: tftp -i 192.168.168.1 put WP54AG_v304_b0618.IMG
6. After the transfer is shown as successful, notice the DIAG LED is now Steady. Do not switch off AP yet. Wait for about 50 seconds till the DIAG LED is blinking slowly. After DIAG LED is blinking slowly, reboot AP now and login again to verify.

You may want to backup the config file first, check with the previous config and also check the transmit power after you reset the config to factory default after this loader and firmware upgrade.