Bricked MikroTik hAP AC2? Any possible recovery?

     I think I bricked a MikroTik hAP ac2 (RDB52G-5HacD2HnD).  It was a used one I bought and I was trying to do a factory reset; held the reset button and powered the unit on.  Did it a couple times and still was not responding to the default IP address.  So I reset it one more time and I think I held the reset button too long...now when it comes on both the PWR and USR leds light and neither changes after that.  So I tried the initial PXE setup process to try and load the the rb.elf file.  No response from the AC2 as no "TFTPd: DoReadFile: rb.elf" seen on the PXE server and the AC2 doesn't respond to PINGs from any IPs in the DHCP range.  So, any hope to recover this or is it toast?  Thanks.