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How To Update LG OPTIUMS GT540 from 2.1 to 2.2 froyo or 2.3 GingerBread on mac?

It is really easy,

Root your phone (there are heaps of guides on that) and download rom manager from the android market. Once you have done that download Cynagon Mod 7 through Rom manager. That will give you a modded ROM and android 2.3.3. With this 'Rom' you can also do some overclocking which basically makes your phones CPU run faster making your phone faster
 
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If you can get a copy of windows, you could use boot camp to install and use windows which will enable you to run fastboot, and all the drivers needed.

Also if you cant you could always try wine, which allows windows applications to run in a virtual environment, but im not too sure if the drivers will work using wine, you might need to try to find mac drivers if there are any.

Not too sure on macs because I have never used them and will never use them.
 
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