Hello,
the reason you can't update is because there's no official 2.2 update from LG for the GW620.
However, there is a group of people developing a custom rom for the GW620, and recently they had access to a korean 2.2 rom which they're using in their current development. They have tutorials on the website explaining how to upgrade the phone and a forum for further doubts.
CAUTION: If you decide to try the software, you may risk damaging your phone!
The site is: OpenEtna
Hope it helps!
Visit LG Mobile Support page.
Under Mobile Product Search, select Cell Phones. ...
Scroll to Manuals & Download and select the Software Update tab.
Download and install the USB Driver for Windows and the LG Mobile Support Tool.
Connect your phone to the computer using a USB cable
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