If you have tried SP Flash Tool and the PC still doesn't "see" the phone, you may have a hardware issue (dead battery, broken motherboard, or corrupted eMMC chip).
Hard bricks sometimes occur because of a corrupted voltage table. Leave the phone unplugged for (3 days). This physically drains the CMOS/buffer memory inside the power management IC. After 72 hours, plug it into a charger. Sometimes, it wakes up. How To Unbrick ZTE Blade A34
The ZTE Blade A34 has a hidden recovery partition. Here is how to access it: If you have tried SP Flash Tool and
