DAA_SIG_VERIFY_FAILED with custom preloader

[mallusrgreatv2]

.....Port - Device detected :) Preloader - CPU: MT6765/MT8768t(Helio P35/G35) Preloader - HW version: 0x0 Preloader - WDT: 0x10007000 Preloader - Uart: 0x11002000 Preloader - Brom payload addr: 0x100a00 Preloader - DA payload addr: 0x201000 Preloader - CQ_DMA addr: 0x10212000 Preloader - Var1: 0x25 Preloader - Disabling Watchdog... Preloader - HW code: 0x766 Preloader - Target config: 0x5 Preloader - SBC enabled: True Preloader - SLA enabled: False Preloader - DAA enabled: True Preloader - SWJTAG enabled: True Preloader - EPP_PARAM at 0x600 after EMMC_BOOT/SDMMC_BOOT: False Preloader - Root cert required: False Preloader - Mem read auth: False Preloader - Mem write auth: False Preloader - Cmd 0xC8 blocked: False Preloader - Get Target info Preloader - HW subcode: 0x8a00 Preloader - HW Ver: 0xca00 Preloader - SW Ver: 0x0 Preloader - ME_ID: 9CA8D57B0A12F38FDE31E389241D7482 Preloader - SOC_ID: 6F1A7B61CE6EEF612936B3DC7E42C1F48921AD8EBE7D5803879C6749394F5B14 Mtk - We're not in bootrom, trying to crash da... Exploitation - Crashing da... Preloader Preloader - [LIB]: upload_data failed with error: DAA_SIG_VERIFY_FAILED (0x7024) Preloader Preloader - [LIB]: Error on uploading da data DAconfig - Using custom loader: ./mtkclient/Loader/MT6765.bin Preloader - Status: Waiting for PreLoader VCOM, please reconnect mobile to brom mode

I'm using MT6765 bin from androidmtk site and another payload to unlock bootloader on Oppo A16. What's wrong here?