n910p Sprint in Europe.

I do live in Uk and Spain, and I purchased this refurbished device knowing that supports 800mhz and 1800mhz enough for calls and 4G data connection in both countries.

It came from china with an unknown ROM, it did work fine with 4G Data.

But I can't live without a rooted device. So I flashed stock ALL_SPT_N910PVPU4COG5_N910PSPT4COG5 then I realized that couldn't be rooted and worse I can't roll back.

Then tried the, among several, next combinations that I remember.

- Stock n910p......OG5 + Auto root = Crash!
- Stock n910p......OG5 + official upgrade to Marshmallow + Root = No SIM signal at all
(this is odd)
- Stock n910p......OG5 + [ROM][6.0.1][TRLTESPR] Emotion AOSP R10 [OFFICIAL] = only 3G only if use menu *#*#4636#*#* toggle to wcdma


So I only need automatic gprs- 3G - 4G and Root independently of being in a custom or stock ROM. Any suggestions?

(Must be a way where sprint user can use the device in Europe and enjoy 4G and calls.)

Thanks

(btw is not my first post, I used to be another member but signing up has been impossible since last web change/ requisite )

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