Different ROM for Lumia?

Hi everyone, :)

I am very interested and I hope someone there will help me out to resolve my question.

So I have Lumia 925 RM-910 which doesn't supports 4G networking. Also I have downloaded in my PC another ROM it's RM-892 which supports 4G LTE networking. Can I flash my Lumia 925 RM-910 with RM-892?

Please help me and explain why yes or why not. :)

It's very important for me.

Thanks for all. ;)

Best regards,
DADA