This post shows the procedures to download the firmware from Edgecore support portal.
STEP1. Visit the Edgecore support portal. https://support.edge-core.com
STEP2. Login the account and find the following red marked. (ONIE, BIOS, CPLD, FPGA, BMC, ACCTON-DIAG, Installation Guide and Download)
*Note: If you don't have an account, please "Sign up".
Reference: How to "Sign up"?
STEP3. Select your model then start to download your own firmware.
1. This mark means the latest firmware.
2. There are two kinds of SSD interfaces in AS5712, AS5812, AS6712, AS6812, (eUSB and mSATA).
Select the corresponding firmware that matches your model. If you don't know how to check, please see the reference. (How to check your SSD interface?)
Reference: How to check your SSD type?