why don’t unlock bootloader without loos data?

hi dear

buy XTC2Clip A few days ago

i try to unlock bootloader with bootloader unlock tab.

But all data erased!!!and The customer became plaintiff

then try Unlock bootloader with SD Mode Editor tab

Tick bootloader unlock Super CID and S-OFF.after done with SD.phone S-off and Super CID But Bootloader Can’t Unlock!

how to unlock bootloader without erase data?

i tested with 3 phone