The device automatically restarts in Preloader mode, which prevents the boot partition from being read.

[CMLNT]

......Port - Device detected :) Preloader - CPU: MT6983(Dimensity 9000/9000+) Preloader - HW version: 0x0 Preloader - WDT: 0x1c007000 Preloader - Uart: 0x11001000 Preloader - Brom payload addr: 0x100a00 Preloader - DA payload addr: 0x201000 Preloader - CQ_DMA addr: 0x10212000 Preloader - Var1: 0xa Preloader - Disabling Watchdog... Preloader - HW code: 0x907 Preloader - Target config: 0x0 Preloader - SBC enabled: False Preloader - SLA enabled: False Preloader - DAA enabled: False Preloader - SWJTAG enabled: False 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: 0xca01 Preloader - SW Ver: 0x1 Preloader - ME_ID: 21EC1E7F1C84206831FCDA241BF7776C Preloader - SOC_ID: 52EEE02F02DD29BC5005402B36A4C8F234F2C8D4973729DBE1EF03EA0E787089 DaHandler - Device is unprotected. DaHandler - Device is in Preloader-Mode. DAXML - Uploading xflash stage 1 from MTK_DA_V6.bin XmlFlashExt - Patching da2 ... XmlFlashExt XmlFlashExt - [LIB]: Write not allowed not patched. XmlFlashExt XmlFlashExt - [LIB]: Hash binding not patched. DAXML - Successfully uploaded stage 1, jumping .. Preloader - Jumping to 0x1000000 Preloader - Jumping to 0x1000000: ok. DAXML - Stage 1 successfully loaded. DAXML - Uploading stage 2... Progress: |██████████| 100.0% Written (0x2D1/0x2D1, ) 0.26 MB/s DeviceClass - USBError(5, 'Input/Output Error') DeviceClass DeviceClass - [LIB]: Device disconnected

In the normal boot state, it automatically enters Preloader mode for 1 second and then proceeds to boot up normally.