Please tell us some basic information before asking for help:
Model Name: ZS630KL
Firmware Version: WW_17.1810.2010.179
Rooted or not: No
Frequency of Occurrence:
APP Name & APP Version (If your issue relates to the app): UnlockTool_18.104.22.168
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
I have problems with unlocking bootloader: official app says that there is unknown error( is code which is shown in the end of the toast). The device was already unlocked before but I have relocked it by an accident(I was able to recover stock rom using fastboot).
Could anyone please help me with unlocking bootloader again.