Galaxy S5 G900W8 cant enable LTE (ex. Wind Mobile phone) topic

Hi there,

Im not sure if this was discussed about this particular situation.

I recently switched from Wind mobile to Fido which offers LTE connection. Unfortunately Wind disabled Lte network mode :( And the only mode I can connect to is 3g.

I have rooted the phone and tried various methods on how to enable LTE
including guide on xda how to enable all bands.

The only thing i have not tried is flashing new modem firmware.

Here is my question:
1. Would flashing new modem firmware enable lte network mode?
if so which modem firmware should i use and is there a guide?
2. Would upgrading to new rom solve the issue?

Please help me, thank you for any suggestions.
Senya