Dell S520 User Manual page 97

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 firmware update, follow these steps:
1 You can download the firmware files from dell.com/support.
2 Press Browse to select the file to update.
3 Click the Update button to start. Wait while the system updates the
firmware in your device.
CAUTION:
the system to crash!
4 Click OK when the update is complete.
Do not interrupt the update process as this may cause
Using Your Projector 97