Not all versions support the MT6765. For stability with the Helio P65, use SP Flash Tool v5.2116 or newer (v5.2204 is recommended). Avoid very old versions (v3.x) as they lack support for modern DA files and security features like SLA/DAA.
Where to find: Official MediaTek website or trusted developer forums like XDA-Developers. sp flash tool mt6765
Note: This is a prescriptive, general procedure — vendors may vary. Assume you have the correct scatter file and firmware. Not all versions support the MT6765
If you own any of these, mastering the SP Flash Tool is almost mandatory: Optional: Uncheck "preloader" unless you must reflash it
Select Firmware Upgrade from the dropdown menu.