Firmware Update

Hello Ensign Infosecurity,

Thank you for reaching out to the community, 

SFOS 17.5 is already EOL declared 30-NOV-2021 - https://support.sophos.com/support/s/article/KB-000035279?language=en_US

Yes, the minimum requirement for v18.5 or v19 is having 4 GB of RAM on the hardware. And your SG125 suffice that requirement.

 Reference points when upgrading to SFOS v18: https://support.sophos.com/support/s/article/KB-000038897?language=en_US