How Can I Root Moto G 1st gen (xt1033) on lollipop 5.1

Hello everyone I have a moto g xt1033 and II just upgraded my firmware to 5.1 ota, and last time when it was on 5.0.2 I just unlocked the bootloader and used kingroot to root it and it worked fine but now even I have an unlocked bootloader no rooting apps are working I've tried kingoroot , kingroot and also iroot but all of them failed to root my device plz someone give me a detailed tutorial on how to root my device because I use a lot of apps that work with root so plz tell me I'd really appreciate it.

I only have access to windows PC

Device details

Moto G 1st generation
Dual Sim
Xt1033
Falcon_umtsds

Running Lollipop 5.1 (latest)