Oppo a31 simlock sucessfuly unlock but still lock

[GBKeyHelp]

OPPO A31 SIMLOCK SUCESSFULY UNLOCK BUT STILL LOCK

SIM UNLOCK
Make sure phone battery level is at least 10%!
Waiting for device... COM70
  Connection : USB 1.0 High-Speed
  USB Driver : [MediaTek Inc.] wdm_usb - Version : 3.0.1504.0
  Boot Mode : BOOTROM [0E8D:0003]
Handshaking... OK
Reading hardware info... OK
  Hardware code : MT6765 [0x766]
  Hardware sw : 8A00 CA00 0000
  Security Config : [0x00] [SCB : No] [SLA : No] [DAA : No]
  MEID : 439F66204AAE7DC03DE2FB5F9BC5404F
Booting META mode... OK
Make sure phone battery level is at least 10%!
Waiting for device... COM79
  Connection : USB 2.0 High-Speed
  USB Driver : [MediaTek Inc.] wdm_usb - Version : 3.0.1504.0
  Boot Mode : PRELOADER [22D9:0006]
Authenticating... OK
Initializing META... OK
Connecting to META... OK [Ver:0] [Rate:921600]
Reading Software Info... OK
  Brand : OPPO
  Board : oppo6765_19581
  Platform : mt6765
  Model : CPH2015
  Android : 9
  Security Patch : 2020-06-05
  Build ID : CPH2015EX_11_A.37
  Build Date : Wed Jun 10 15:31:26 CST 2020
  Oppo Name : OPPO A31
Reading LOCK STATE... OK [��������]
Unlocking SIM... OK
UNLOCKTOOL 2022.02.21.0
Elapsed time : 21 seconds