Team Win Recovery Project
Team Win Recovery Project (TWRP) - a recovery used in and build with Omni ROM by default. TWRP is developed by Dees_Troy.
A device tree has to be configured properly (TWRP-ified) in order to build in Omni sourcetree.
Usually the changes consist of:
- adding TWRP specific build flags in BoardConfig.mk
- creating twrp.fstab file
- adding twrp.fstab to PRODUCT_COPY_FILES make variable
For a detailed tutorial look there: