Based on your troubleshooting you have done, since the ICX 7150-12P out of band Ethernet port is not responding you will not be able to perform the software recovery, so this unit must be RMA (return merchandise authorization) means replace it.
Feel free to contact us via chat, comment you already have a post, copy the link from the post and paste it into the chat to start unit replacement.
If you come back to the boot mode state (CX7150-Boot>) and the ping keeps failing you will not be able to perform the software recovery, this is why I have approved the RMA, however, you can try the factory reset let me add the steps, and if it comes back, out of the boot state, please upgrade to the recommended code 08095g, I will add the guides too.
Remove power from the switch.
Press and hold theResetbutton while applying power to the switch.
After all the system LEDs flash amber, release theResetbutton.
When all the system LEDs blink green, all the configuration data are erased and the switch is returned to its factory configuration. When all the system LEDs are solid green, the erase process is complete and the system reloads. Once reloaded and the SYST LED is steady green, the factory reset is complete.
How to Upgrade a Switch ICX-7150-C12P using a USB flash drive