@Giomen , I recommend an obvious procedure, but you may not have done. I've had similar problems with my Etrex 30 and the process of installation of the new firmware took almost of 30 minutes. If you can get into pre-boot "forget " the GPS updating and only come back to check after some time. Another obvious step is to try with other firmware, newer or older. I would try with the latest , v3.70. Finally, there is a noeman's user who knows very well the firmware and hardware of Etrex 20, I believe that his name is Hauter or something. Surely he can help you..
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