Dell 4220 User Manual page 91

Firmware Upgrade
Use the Firmware Upgrade page to update your projector's wireless firmware.
NOTE:
Please disable and enable wireless/network using the OSD to restart
the network card for the projector after firmware upgrade is successful.
To start the firmware update, follow these steps:
1
Press Browse to select the file to update.
2
Click the Update button to start. Wait while the system updates the firmware
in your device.
CAUTION:
Do not interrupt the update process as this may cause the system to
crash!
3 Click OK when the update is complete.
http://www.pureglare.com.au
Using Your Projector
91