This is an incomplete guide on how to flash the stock ROM (or in this example beta ROM with userdebug) on your Pro1-X. I used the windows instructions from Fxtec, and you should certainly read them and use them to assist in working through the reflash.
I searched for an alternative to the recommended QFIL, and found a linux tool called QDL (Qualcomm Download). This tool allows you to flash Fxtec's XML-based stock firmware to your Pro1-X using Emergency Download Mode (EDL).
I used this successfully to move from Sailfish OS to Android 2.1.6_userdebug. This may not be suitable for every