[Q] Silver lining with rooting Fujitsu Arrows A 301F topic

Hey guys, I wasted about 4 hours, wishing to find a method to root my phone. The Fujitsu Arrows A 301F, just like the other Japanese phone, is very tough to unlock. However, several minutes ago, I found out that I can enter the recovery mode. I get there by pressing the fingerprint button, the power button and the vol- button together. Inside, there are two options only, one is cancel and the other is system check. I also find out that if I press the fingerprint button and the power button together, the recovery like screen appear. But it is called SD Download. I don't know how to use it. I hope someone can use them to find ways to root it. :D

P.S. When I use commend prompt and type "adb reboot recovery", a recovery like screen load up but saying:
Paramatar is unkown mode! [4]
start recovery_result
Rebooting!