Do enter random “unrst” commands on a production UCS server or any critical device without knowing the exact context — it could trigger a factory reset or firmware rollback.
sudo ./unrst --help sudo ./unrst --device /dev/sdX --mode factory-reset
To perform an unrst (un-reset / factory reset or unbrick):
Can be used as the source image for a "refresh upgrade" where the underlying OS version changes. Preparation Checklist Before using this image, ensure you have the following:
Select , browse to your uploaded image, and select it. Check the box for Connect at power on . Step 2: Adjust VM Boot Order bootable ucsinstall ucos unrst 8621000014sgn161
: Under the same Bootable menu, ensure Generate Bootinfotable is checked.
: Decodes to version 8.6(2) Extended/Engineering Special , specifically base build version 8.6.2.10000-14 , signed with Cisco's .sgn security extension.
Connect to the FI console using:
There are several reliable, free tools you can use to write the ISO image to a USB drive and make it bootable. Do enter random “unrst” commands on a production
Locate the isolinux folder inside the ISO. Right‑click on the file isolinux.bin and select Extract To… , saving it to a temporary folder on your hard drive.
Once you install an image, you are permanently locked into the unrestricted software track. Carefully evaluate your organization’s encryption requirements and regulatory obligations before choosing UNRST over the Restricted release.
: Some Cisco OVA (Open Virtualization Appliance) templates do not include the application software. In such cases, you must deploy the OVA and then use the associated bootable ISO from the datastore to install the software.
Cisco UCS Bootloader v2.0 Entering boot menu... Press 'b' to boot UCOS, 'c' for recovery shell. Check the box for Connect at power on
: This is the name of Cisco's internal installation utility. It's the engine that packages and executes the software installation process.
The string "bootable ucsinstall ucos unrst 8621000014sgn161" is a keyword variation or filename fragment associated with a installation and upgrade image.
. Because it lacks certain encryption functionalities found in the "Restricted" (RST) version, it can be exported and used in countries with strict import/export restrictions on encryption technology. Key Technical Aspects Installation Scope