I can ensure you that US UNLOCKED firmware works on Sprint V40, I flash it to everyone course it is bloatware free. Also I do full system backup in case of official unlock will be done later.
Why do you want Verizon fw? What features do you need?
90% that voice via up (internet calling) will not work.
Hi.. thats not work because the APN settings is grayed out. Next week I go to bring my phone to sprint store to see if they can fix that.Nothing a simple google search cant help with
I do belive this is ur model please double check dont wanna be responsible for a bricked phone but 99% sure that it is