Accessing the BIOS

This guide explains how to safely access the BIOS of your Ugreen NASync device and make important initial configurations.

Methods to Access BIOS

There are two simple methods to access the BIOS/Boot-Menu of your NASync:

Method 1: Keyboard Shortcuts

During boot, continuously press either of these key combinations:

• Ctrl + F2
• Ctrl + F12

Method 2: SSH Command

If you have SSH access enabled in UG-OS:

1. Login to your device via SSH
2. Execute the following command:

systemctl reboot --firmware-setup

WARNING

Some unofficial guides suggest renaming the EFI folder in the boot partition. This method is not recommended as it unnecessarily modifies the boot partition and could potentially cause issues.

Important BIOS Configuration

Disabling the Watchdog

The watchdog is a security feature that will restart your device if UG-OS is not running. This can interfere with BIOS configuration and alternative OS installations.

Important

It's recommended to disable the watchdog as your first action in BIOS because:

1. Being in BIOS counts as "UG-OS not running"
2. The watchdog will force a restart after a few minutes if not disabled
3. This can interrupt your BIOS configuration process

Steps to disable watchdog:

1. Enter BIOS using one of the methods above
2. Navigate to the watchdog settings
3. Disable the watchdog feature
4. Save changes and reset
5. Re-enter BIOS to safely continue your configuration

After disabling the watchdog, you can freely explore and configure other BIOS settings without time constraints.

Credit

This guide is based on the work of Florian Faber