To understand the firmware, you must understand the hardware it runs on. The ZTE Blade A34 is powered by the chipset.
Use Wwr_MTK (for MediaTek) – but Unisoc requires different tools. For backup, use SP Flash Tool readback option (advanced users only).
Common issues & fixes:
To check for and install official firmware updates without external tools: System Update
If your phone is acting strangely after a minor software glitch, it might have entered