1.copy .sys file into the root of USB flash
2.insert USB into DSA
3.press storage button to find the .sys file 
4.go to the third page of the menu find sys update
5.press sys update button 
6.after finish update ,reboot DSA to check the current version 
Note: Do not power off the instrument or move the USB flash during the updating.

If DSA815¡¯s current version is 00.01.00.00.00 ,use update file may cause below issues :
Model info ,serial info ,software version info ,Boot version info ,logo when power on ,MAC address ,language ,cal data, option license losing ,because these info are not included in the update files .To solve these problems ?
1. Power on DSA815
2. Copy attached Version01Update.sys file to the root of USB stick and plug USB into DSA815
3. Press storage button ---sys update and chose Version01Update.sys
4. After finished update ,power on DSA815 and use 00.01.07 firmware to update again