What program to flash my Lumia 550

[Maritox Cacici]

So this is my problem, the RM that came from factory its the RM 1127, wich doesnt gets the LTE signal in my country (Argentina), the one i should use its the RM 1128, the phone isnt locked with any carrier, so, i downloaded a Country Variant of the RM 1128, but i dont know wich program to use, time ago i used the nokia care wich used to let u pick up the ROM u wanted, but the actual Microsoft Recovery detects ur phone and only lets u download the same model.

So Wich program to use? And will this let me connect to the LTE signal?
I changed the RM on my old 520 and the phone worked without problem, but that time the signal wasnt the issue.

 

[Chintan Gohel]

I think the windows device recovery tool can give that option if you select my phone wasn't detected option