As stated before, the EPC 1522 was designed as a PLC along with security measures to serves that purpose. The security measures include locking the BIOS and disabling the one-time boot menu in order to protect the files system in the same manner as other PLC Next controllers to harden the device from external and physical attacks.
If you would like to try the Ubuntu Core 24 on similar hardware as the EPC 1522, the BL2 BPC 1501E-W-box PC (art. no. 1141843). The BL2 BPC 1501 is an open PC with unlocked BIOS and without operating system to allow you to test the Ubuntu Core 24.
Kelley VanBuskirk
Application Engineering Supervisor
AS HMI/IPC Product Support Group