Help with a radio modem pliiisss!! - AT&T Samsung Galaxy S II Skyrocket SGH-I727

Hi!
I flashed all modems what a saw a nothing with my 3g internet service, i obtain edge only. The 3g internet frequencies in my service is in 900-970 Mhz in Dominican Republic. Wich modem i need flash to have my 3g service? My device:
Skyrocket
4.2.2 CM
Stock kernel
Pd; i tried all att and tmobile modems in the vicom without result!

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SM-N910H 3g network issue.

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NO 4g Signal in XT1541 . Can i flash XT1550's Modem Files on Xt1541? Plz help!!

Hey there!
I have XT1541 ( UK edition Single sim 1gb ram model ) . I am on Stock MM noq and some days ago i bought a 4g JIo sim but it wasn't showing any service in my phone only. The same sim is working in other 4g phones so i flashed different roms including stock LP, MM and few custom roms but still it isnt showing any network. So, i was wondering that XT1541's modem files aren't working here in india for 4g Bands . So, can i flash the indian variant's modem files so i could get my network Back
Or if i am wrong, can you please guide me somehow because this issue has pissed me so much
@lost101 my 4g provider supports 2300Mhz or 1800Mhz or 850Mhz bands but i guess XT1541 only supports 2100, 1800, 2600, 900 , 800 Mhz bands . can you please help me somehow ??
No, you cannot open any additional LTE bands, and radios from any other device will not work properly. The LTE bands are locked in a way we cannot change them.

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