A71 CPH1801 Unlock Password Problem

[Samnangupdate]

Selected Model : Oppo A71
Code Name : CPH1801
Operation : Factory Reset [1]
Authenticating... OK
Retrieving data... OK [222.87 KiB]
Initializing data... OK
Searching for HS-USB QDLoader 9008... COM5
Connection : USB 2.0 High-Speed
USB Driver : [Qualcomm Incorporated] qcusbser - Version : 2.1.2.7
Connecting to device... OK
Handshaking... OK
Reading bootloader info... OK
Serial : 3523396847 SoC : [Snapdragon 450] [SDM450] [0x0009A0E1]
OEM : Qualcomm [0x0000] Model : Unknown [0x0000]
PK_HASH[0] :05F06BA44EEB2ABDF14BB644AABC2E69
PK_HASH[1] :3DDF7B8711CC7CF07D4CD0EB2E1A8728
Writing flash programmer... FAIL
[Sahara] Firehose verification failed!

UNLOCKTOOL v2021.08.03.0
Elapsed time : 3 minutes 7 seconds

please help .....