So, for some reason I can't seem to get into fastboot. I previously had Sailfish X installed on this (came that way from the ebay seller and was the reason I bought it initially), so I'm not sure if that's partly why, but if I hold volume up and put in the usb cable, it just starts with a red led, then goes to charging. If I do a hard reboot (hold volume up and power past three vibrations) sometimes I can get it to go into what looks like fastboot (blue led), but the one time I got it to work the ubports installer still wouldn't recognize it.

Any leads as to how I could fix this? I'm pretty new to the android modding scene, and it was absolute hell just getting stock android back onto my other Xperia, the XA2 haha. The X is a much more solid device imo though, and I'd love to get it up and running again.