Given the low level at which APX (Nvflash) mode runs and how this is much more primitive than booting into a standard Android recovery partition, a device with the appropriate blobs is practically unbrickable. Thus, blob files can be used to get us out of seriously sticky situations that would otherwise be unrecoverable without major device surgery involving tools that only XDA Elite Recognized Developer AdamOutler should play with.
Flatline creates these blobs for the aforementioned devices. A custom recovery image is used to flash a custom bootloader, as well as generating the appropriate blobs. This solution is unique from other Nvflash solutions in that doesn’t require a working /data partition for image storage. Rather, blobs can be retriedved from /tmp/AndroidRoot, as explained in the guide linked below.
You can get in on the discussion by visiting the original thread. To go ahead and get started on your own device, visit the developer team’s full guide, complete with modified recovery images and all other required files.