Do not install firmware version 1.25 unless you are absolutely certain you need it.
Here’s why:
Since the official removal of legacy files, version 1.25 is primarily found on: samsung scx-4300 firmware 1.25 download
Samsung sold its printer division to HP Inc. in 2017. As a result, official firmware for legacy Samsungs is now hosted on HP’s support website. Do not install firmware version 1
Step-by-step to the official file:
Alternative Safe Source: