HELP ! VIVO Y15 Dead Phone MediaTek Help me plz

[topphonepk]

i'm follow this vdo but failed

BOOT DEVICE
Authenticating... OK
Initializing usb... OK
Waiting for device... COM4
Bypassing authentication... OK
Analyzing preloader... preloader_k65v1_32_bsp_2g_ago.bin [EMI:15] [Custom]
Handshaking... OK
Reading hardware info... OK
Hardware : MT6765 [Helio G25|G35|P35] 0766 8A00 CA00 0000
Security Config : SCB SLA DAA
MEID : 0610D99326E12CF09FB3CEF4CD11B2CE
Sending Download-Agent... OK
Syncing with target... OK
Booting device... FAIL
Ext.RAM : No response from device!
Please use custom preloader to boot!
UNLOCKTOOL 2022.04.01.0
Elapsed time : 8 seconds

 

[topphonepk]

Sometime

BOOT DEVICE
Authenticating... OK
Initializing usb... OK
Waiting for device... COM4
Bypassing authentication... OK
Analyzing preloader... preloader_k65v1_32_bsp_2g_ago.bin [EMI:15] [Custom]
Handshaking... OK
Reading hardware info... OK
Hardware : MT6765 [Helio G25|G35|P35] 0766 8A00 CA00 0000
Security Config : SCB SLA DAA
MEID : 0610D99326E12CF09FB3CEF4CD11B2CE
Sending Download-Agent... OK
Syncing with target... FAIL
Failed to receive SYNC! Result : 0xFFFF
UNLOCKTOOL 2022.04.01.0
Elapsed time : 35 seconds

 

[Sangpuiipa]

Bro, Maybe EMMC Error. Hardware failure