HSDPA/Data Speed Issue

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http://forum.xda-developers.com – Hi all, Just wondering if anyone can think of anything else to try to resolve an issue im having with my S3. It is locked to 3 (UK) and runs the ALE8 firmware. Over the weekend I flashed the LFB firmware from Samfirmware using Odin, but I noticed my data speeds we're a lot slower than normal and my phone struggled to get to H+. I decided to flash back to ALE8 but now my phone flicks between 3G, H and H+ and speed test results average 0.5 - 2 mb where as before it was constant H+ pulling between 4-6 mb. 2 factory resets and redoing APN settings hasnt worked so running out of option (HowTos)