For the Sun Enterprise 450 system and the Sun Ultra 450 workstation you do not have to change jumper pins. Instead, you move the keyswitch to allow the flash PROM to be write-enabled.
When the switch is set to the Locked position (Figure 4-5), the flash PROM is write-protected. When the switch is set to the On or Diagnostics position, the flash PROM is write-enabled.
Turn the keyswitch to the On or Diagnostics position (Figure 4-5) before updating the flash PROM.
Disabling write-protection the Sun Enterprise 450 system or the Ultra 450 workstation assumes that the write-protect/enable jumper was set in the default position (enabled). If you previously changed the write-protect/enable jumper to be write protected, perform the steps to make the flash PROM write enabled in "Location of Flash PROM Jumpers in Sun Enterprise 450 System and the Ultra 450 Workstation". You must change the jumper to be write enabled before continuing with the flash PROM update procedure.