Partition table mismatch. Fix: In SP Flash Tool, go to Format -> Auto Format Flash -> Format whole flash except Bootloader . Then re-attempt the Download.
For those determined to DIY, always verify the checksum (MD5/SHA1) of the downloaded firmware against community-shared hashes, and never flash a file labeled “CPH1819_MT6771_Test” – those are engineering builds that can permanently lock your bootloader. firmware oppo f7 cph1819
