S3 sgh-t999 not work on wcdma - Galaxy S3 Neo Q&A, Help & Troubleshooting

Hi, I'm from Argentina and I have a s3 model SGH-T999 T-mobile and now I'm using it with movistar Argentina. The problem is that does not connect to WCDMA only works with edge. Movistar uses the bands 850 and 1900 and this equipment is compatible with these bands but when I select WCDMA signal runs out. Please I need urgent help! I apologize for how badly I write, not English and I am using the translator. Who can help me I will be eternally grateful!
Enviado desde mi XT1063 mediante Tapatalk

May bw this'll help ya - http://forum.xda-developers.com/showthread.php?t=2394689

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alraheep said:
Hello all, I was wondering if anyone has found a way to flash GT-I9505G modem with any international GT-I9505 Lte? The reason is to get other lte bands support such as 2600, 1800 etc
Is that possible? Or it is a hardware that is incompatible?
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Click to expand...
Click to collapse
Any idea? I highly appreciate your help
alraheep said:
Hello all, I was wondering if anyone has found a way to flash GT-I9505G modem with any international GT-I9505 Lte? The reason is to get other lte bands support such as 2600, 1800 etc
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Click to expand...
Click to collapse
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