Yes, the fastboot file was to be a specific one. I can't remember where I get the correct one (my work folder is a mess with many files) but eventually is one from the links he give.Hi, I'm also trying to unlock the bootloader of my t1020s but without much luck. I used AllexBast chinese guide and its .apk to get the signature.bin but the command "fastboot flashing unlock-bootloader signature.bin" always fails printing "fastboot: usage: unknown 'flashing' command unlock_bootloader". Did something similar happen for you? Any ideas? Thanks in advance.
Go and try different fastboot files until one works.