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.