Every time I try the OTA download it gives me an error while installing, which I presume is because I've rooted the phone.
It's a European model if it matters.
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Sign up to join this communityYou might have to (re-) flash the complete (stock) ROM. Rooting involves changing things on the /system
partition, which changes its checksum. Some OTA updates use the checksum to see whether the update "fits", and thus will refuse to install if not. Looks like your Moto falls into this category.
you can unroot it by using framaroot before that put a superuser in your storage and then you can have the option of unrooting your phone,and the other way is use cyanogenmod
/system
to do it. The easiest thing to do is to flash the new ROM manually (instead of OTA), but I'm afraid I don't know the procedure for flashing Motorola phones. Maybe this advice will help you find the answer, though.