Cannot unlock bootloader of P30

[Valdemaras]

You may try to, though the problem might be more serious. Just after flashing board, you need to flash stock rom as well, otherwise bootloader unlock won't work.

[psp7456]

You need to flash nv backup. May try one of availables on support area. You may review files here: https://www.dc-unlocker.com/firmware-catalog in filter field enter "backup" and look for file matching your phone's cpu. You should flash it on dc-phoenix in testpoint mode.

Thanks for answering.I did flash all these 3 versions of nv-backup but still it showed these error logs.

When I used hcu client and dc-phoenix in testpint mode, the software always says ‘looking for fastboot mode’ message box and just like this:'2023-02-01 04:59:20.442 Waiting for device REMOVAL/INSERTION...' which is very diffrent from offical tutorials and Video tutorial.Is it normal?

I guess maybe it is the downgrade method did not change the nv patition? My phone was in Harmony OS and I downgrade it to EMUI9.1 by HiSuite.Proxy.V3.3.0.

May be I should try to flash my phone in 1.0 com mode the original board 9.1 firmware.

[Valdemaras]

You need to flash nv backup. May try one of availables on support area. You may review files here: https://www.dc-unlocker.com/firmware-catalog in filter field enter "backup" and look for file matching your phone's cpu. You should flash it on dc-phoenix in testpoint mode.

[psp7456]

Repair
New FB User Lock : UNLOCKED
Unlock downgrade/customization limitations
Selected Cpu/Bootloader - Kirin980_P1_V3
2023-02-01 04:57:48.796 Connecting to server...
2023-02-01 04:57:49.702 Connected!
2023-02-01 04:57:50.858 Find device COM18, handle 11500
BOOTLOADER selected to update:Kirin980_P1_V3
downloading file Kirin980_P1_V3_0.dtwork...
downloading file Kirin980_P1_V3_2.dtwork...
downloading file Kirin980_P1_V3_3.dtwork...
downloading file Kirin980_P1_V3_4.dtwork...
downloading file Kirin980_P1_V3_6.dtwork...
2023-02-01 04:59:20.442 Waiting for device REMOVAL/INSERTION...
2023-02-01 04:59:35.540 Operation timeout
2023-02-01 04:59:35.540 Operation timeout
2023-02-01 05:00:51.437 Waiting for device REMOVAL/INSERTION...
2023-02-01 05:01:06.536 Operation timeout
2023-02-01 05:01:06.536 Operation timeout
2023-02-01 05:01:36.921 Waiting for device REMOVAL/INSERTION...
2023-02-01 05:01:36.921 Device ready!
2023-02-01 05:01:36.937 Connecting to server...
2023-02-01 05:01:37.858 Connected!
2023-02-01 05:01:39.311 Unlocking bootloader...
2023-02-01 05:01:39.311 Reading Certify data...
2023-02-01 05:01:40.108 Reading Certify data success!
2023-02-01 05:01:40.108 Signing Certify data...
2023-02-01 05:01:41.717 Reading info...
2023-02-01 05:03:33.747 IMEI certifiacate backup success!
2023-02-01 05:03:35.028 Done!

Fastboot provided info:
CPU: kirin980
Model: ELE-AL00
Firmware: ELE-AL00 9.1.0.226(C00E220R2P1)
Vendor: all
Country: cn
SN: GBG5T19712018327
PCB SN: 5T6RXT197E048384
WIFI MAC: 20DA22F8EBDC
Theme color: black
Device color: black
FBLOCK: 1
Bootloader FB lock: unlocked
Bootloader User lock: locked

Found signed IMEI:
Key: 0x6000
IMEI1: 867029041814170
IMEI2: 867029042044355
SIM NW_LOCK status: UNLOCKED

Found OEM data:
IMEI:867029041814170
IMEI1:867029042044355
Model: ELE-AL00
Vendor: all
Country: cn
Version limitation: OFF
Bootloader User lock: locked
Phone ID: E2FE0AECE798BE3
2023-02-01 05:05:56.990 Repairing...
2023-02-01 05:07:03.810 Missing security params, Write Booloader Lock Status skipped!
2023-02-01 05:07:03.857 Write partition oeminfo...
2023-02-01 05:08:29.773 Write partition oeminfo success!
2023-02-01 05:08:29.804 Unlocking restrictions...
2023-02-01 05:08:30.108 Unlock restrictions success!
2023-02-01 05:08:30.117 Done!

Memo log saved to F:\P30\HCU_0382\Logs\20230201_050830_HCU_XloaderRepair_E2FE0AECE798BE3.txt
​

2023-02-01 05:07:03.810 Missing security params, Write Booloader Lock Status skipped!

how to solve?

[psp7456]

while try to unlocking bootloader , the hcu client log:

Found OEM data:
Model: ELE-AL00
Vendor: all
Country: cn
Version limitation: OFF
Bootloader User lock: locked
Phone ID: E2FE0AECE798BE3
2023-02-01 01:45:19.032 Repairing...
2023-02-01 01:46:22.907 Missing security params, Write Booloader Lock Status skipped!
2023-02-01 01:46:22.938 Write FBLOCK for this model not supported, skipped!
2023-02-01 01:46:22.938 Write partition oeminfo...
2023-02-01 01:47:48.756 Write partition oeminfo success!
2023-02-01 01:47:48.788 Unlocking restrictions...
2023-02-01 01:47:49.084 Unlock restrictions success!
2023-02-01 01:47:49.084 Done!

still can not unlock the bootloader , please help,thanks!