How To Unbrick Zte Blade A34 -
If the factory reset fails or the device cannot boot into recovery, the system partition must be rewritten using the Stock ROM. The ZTE Blade A34 utilizes a MediaTek (MTK) chipset, requiring the SP Flash Tool.
For a "soft-bricked" phone that wouldn't even enter Recovery Mode, the owner had to perform a deeper surgery by (firmware) using a computer. How to Download Firmware for ZTE Blade A34?, How To How To Unbrick ZTE Blade A34