Eaton® setUPSFirmware upgrade procedureEaton®setUPS_5PX_firmware_upgrade_rev_02 Page 9/147. Confirmation The following screen appears which reminds you that UPS output is OFF during theupgrade, select “Yes” to continue8. Upgrade process A click noise comes from the UPS (relay) and it transfers into Boot loader mode. Thefirmware will then be erased and then rewritten into the UPS.During the flash process, the display on the UPS goes blank and the AC line, the batteryand the Alarm lights cycle. This is normal.