These F3548 switches come with OS installed. You would have to upgrade with xxxx.swi file. In case switch stuck in ONIE and wipe out existing OS then we can install yyyy.installer file with ONIE installations. Please check newest version in 1.2.0.5.zip folder in the following link on our website.https://www.supermicro.com/wdl/Firmware/Switch/SSE-3548/ 
ONIE installations:With USB:Rename xxx.installer to “onie-installer” filename
Copy the file “onie-installer” file to a USB drive
Connect the USB drive to the switch
The ONIE auto discovery process should detect image and install  the image. The switch may get reboot one time and give cumulus prompt. With Network:ONIE should start auto discovery, we should stop auto-discovery:
onie# onie-discovery-stop
Configure Management IP and check with ifconfig:
ONIE:/ #ip addr add 192.168.3.10/24 dev eth0

Install image with tftp server:
ONIE# onie-nos-install tftp://local-tftp-server/xxx.installer