Because MediaTek continuously patches BROM vulnerabilities (e.g., the infamous "kamakiri" exploit), older clients fail on new firmware. V53 represents a middle ground—stable enough for production use yet still "free" compared to subscription-based tools.
If you're looking to download the MTK Client Tool V5.3, ensure you do so from a reputable source to minimize risks. Always back up your data before using such tools, and be aware of the potential risks involved in modifying your device's software. free link mtk client tool v53
If you want to back up a full ROM: