I opened the bootloader, it won't lock again!
 

14.02.2021 18:37:34
HCU Client v1.0.0.0373
Account: xxxxxx

Before operation turn phone to TestPoint mode:
Turn off phone, then short TestPoint on phone pcb
and plug USB cable
Wait for device "HUAWEI USB COM 1.0" in Ports


Repair
New FB User Lock : RELOCKED
New downgrade/customization limitations : UNLOCKED
Selected Cpu/Bootloader - Kirin970_T1_A8.1_V6
2021-02-14 18:37:35.365 Connecting to server...
2021-02-14 18:37:35.818 Connected!
2021-02-14 18:37:36.349 HUAWEI device in Test Point mode Not found!
2021-02-14 18:37:36.427 Reading info...
2021-02-14 18:37:40.474 Done!

Fastboot provided info:
CPU: kirin970
Model: COL-L29
Firmware: COL-L29 9.1.0.353(C432E5R1P13)
Vendor: hw
Country: eu
SN: Uxxxxxxxxxxxxxxxx
PCB SN: Dxxxxxxxxxxxxxx
FBLOCK: 0
Bootloader FB lock: unlocked
Bootloader User lock: locked

Found signed IMEI:
IMEI1: 8xxxxxxxxxxxxx
IMEI2: 8xxxxxxxxxxxxx
SIM NW_LOCK status: UNLOCKED

Found NV data:
Modems: 3
IMEI1: 8xxxxxxxxxxxxxx
IMEI2: 8xxxxxxxxxxxxxx
IMEI3: 000000000000000
PESN: 00000000
MEID: 00000000000000

Found OEM data:
Model: COL-L29
Firmware: COL-L29 8.1.0.121D(EUC652)
Rescue: rescue:Chipset-boston 8.1.0.001(013V)
Vendor: hw
Country: eu
Version limitation: ON
Bootloader User lock: locked
Phone ID: 07BF0CBAA8A0FFE
2021-02-14 18:37:45.005 Repairing...
2021-02-14 18:37:45.021 Write FB User lock not supported for this model, skipped!
2021-02-14 18:37:45.036 Write partition oeminfo...
2021-02-14 18:37:47.036 Write partition oeminfo success!
2021-02-14 18:37:47.083 Unlocking restrictions...
2021-02-14 18:37:47.099 Unlock restrictions success!
2021-02-14 18:37:47.114 Rebooting...
2021-02-14 18:37:47.130 Reboot success!
2021-02-14 18:37:47.146 Done!