I'm pretty sure your only remedy is to sbf if the data wipe didn't do it. Will the phone charge while it's turned off? You will need to find a charged battery otherwise. I called my local VZW store and asked if they had any X2 batteries in stock. Then I took my laptop in, borrowed the battery and sbf'd my X in the store. They were accommodating and intrigued with what I was actually doing. But I digress.
You're going to need a charged battery otherwise, as you now know, the bootloader will just show that error.