Hi. I'm getting the same error message. It's from the HTC Developer site. I can get as far as the step where you "submit" the token, and after submitting the token, the "error 160" message pops up. I've copied the "identifier token start" as carefully as I can multiple times, but I get the same error message.
The bootloader screen on my ATT One X has the first three lines at the top as "Locked", "EVITA PVT SHIP S-ON RL" and "HBOOT-1.14.0002". The Android version is 4.0.4, the Software number is 2.20.502.7 710RD, the Kernel version is 3.0.8-01558-g7f75e5b. I'm using Straight Talk as my carrier, so the phone has a ST SIM, if any of that helps.
Any ideas on how I can unlock the bootloader? Thanks in advance for any help.