can't install xg firmware into utm now?

Hello Hyun-wook Hong,

What is the model of the UTM or SG appliance you have. As SFOS requires minimum of 4GB RAM.

You can download the latest OS of v18.5 or v19 from here: https://download.sophos.com/firmware/HW/index.html

OS like v17.5 [requires only 2 GB RAM] is already declared  EoL - is maintained for XG 85(w) and XG 105(w) until these hardware models go End-of-Life.  - https://support.sophos.com/support/s/article/KB-000035279?language=en_US

thanks for quick answer!

I have a utm120 rev5. i heard that it have 2gb ram and expired device.

then, what firmware file i need to download? in https://download.sophos.com/firmware/HW/index.html, firmware of 17.5.17 are 5.

sincerely,

ASG/UTM Hardware is not supported by SFOS. 

So you can install the Software Image, if you want. But you need to wipe the disk first. 

Yup as LuCar Toni mentioned ASG/UTM Hardware is not supported by SFOS.  SFOS 17.5 MR17 is maintained for XG 85(w) and XG 105(w) only until these hardware models go End-of-Life.

You'll need a new line hardware XG appliance or next gen XGS models...
Hyun-wook Hong