Flasher boxes are commonly used for Unlocking/Reading Security codes, Hex dumps and JTAG. As for recommendations, see link provided above - NsPro, SHU-BOX, ATF Nitro etc... FoneFunShop are a very good supplier in the UK and have used on many occasions:
http://www.fonefunshop.co.uk (UK based option).
Hope this helps!
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