Possibly bricked moto g4 plus XT1644

I was trying to flash the official OTA for Android Nougat in XT1644 since the OTA hadn't get. After reading, found this tutorial , and now my Moto G doesn't start properly, it says something like "failed to verify boot image". I ran this tutorial while working on Ubuntu 16.04 having installed adb-tools and fastbool-tools package. Decided finally unlock bootloader (which worked) and install TWRP (which did not work), and here's the output for the TWRP flash: How can I manage to install the official Nougat update for XT1644?