Most Meberry M7 firmware is distributed as a scatter.txt file for use with MediaTek's SP Flash Tool, because the M7 uses a MediaTek chipset.
Step-by-step SP Flash Tool Process:
Cause: The firmware you flashed was for a different touchscreen digitizer (some M7 variants have Goodix or FocalTech panels).
Fix: You need to flash the correct Meberry M7 firmware variant. Look for a file marked touch_fix or revert to your previous working build. meberry m7 firmware
Cause: Corrupted system partition or incompatible firmware version. Fix: Boot into recovery (Volume Up + Power), perform a factory reset and wipe cache partition. If that fails, re-flash the firmware using SP Flash Tool with the "Format all + download" option (note: this will erase your device's unique identifiers, but it will recover from a boot loop). Most Meberry M7 firmware is distributed as a scatter