Can't unlock bootloader?

This is what I get in Flashtool. It says that the bootloader is unrootable. Is there some other way to unlock it?
It's a X10 Mini Pro.

Code:

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29/048/2016 11:48:53 - INFO  - Processing loader.sin
29/048/2016 11:48:53 - INFO  -    Checking header
29/048/2016 11:48:53 - INFO  -    Flashing data
29/048/2016 11:48:55 - INFO  - Loader : S1_Loader_Root_8e35 - Version : R4A045 / Boot version : R8A029 / Bootloader status : UNROOTABLE
29/048/2016 11:48:55 - INFO  - Max packet size set to 65536K
29/048/2016 11:48:55 - INFO  - USB buffer size set to 65536K
29/048/2016 11:48:55 - INFO  - Opening TA partition 2
29/048/2016 11:48:55 - INFO  - Start Reading unit 00 00 08 51
29/048/2016 11:48:55 - INFO  - Reading TA finished.
29/048/2016 11:48:55 - INFO  - Closing TA partition
29/048/2016 11:48:55 - INFO  - Ending flash session
29/048/2016 11:48:55 - INFO  - Waiting for device to reboot

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