Problem with updating firmware - both Linux & Windows

[CANtactor]

Hey there,

I am working on Kali GNU/Linux 2.0 (sana) 64-bit where I made some changes to the fw, compiled it with make, and then wanted to download it to CANtact using the instructions for Windows here and here (discuss.cantact.io).
After installing the driver I get the error "Device cannot start - code 10", therefore DfuSe tool fails with upgrading. I tried to fix this by executing all of the mentioned fixes here, but nothing worked. Can anyone help me?
[Tried it on WIN7 64bit, WIN8 including driver signature disabling)]

Also I updated the fw on Linux with make flash, but different versions of the fw all have the same md5 checksum, telling me the fw remained unchanged. Am I right?