You can still recover your device. It's a bit complicated, but if you can get your device to shut down and be completely off, then you just need SP Flash Tools and the correct ROM. You said that you only needed to use the DeepTest APK in order to unlock, correct? This means that your model is very likely the RMX2151 model.
Follow steps one through to ten
inclusive. Download the provided files, but DO NOT use the ROM provided in the MEGA/Android File Host link if your model isn't an RMX2155.
If your model is RMX2151, download the a.87 version of the firmware from here:
MediaFire is a simple to use free service that lets you put all your photos, documents, music, and video in a single place so you can access them anywhere and share them everywhere.
www.mediafire.com
After downloading, you'll need to extract the OFP. Should be able to find a guide for that using Google pretty easily.