can't enter the fastboot mode - xperia mini

[symish]

Hi all

I'm trying to enter the fastboot mode on my smultron, it always appears the cyanogen recovery page but no way to get into fastboot mode, the device is not recognized by flashtool nor cmd. Any advice to unlock it? I had installed the cm13 legacyxperia rom and wanted to updated it. Now the phone is completely dead; I already did a factory reset and swiped everything from the cyano recovery page, which is the only one I can have access atm

thanks in advance