I hope you didn't use any 'international characters' when you customised the start-up screen because that will brick the unit, instantly!
Go and grab one of those reworked firmwares from Noeman/GPSPower, the ones that use the Etrex 30 firmware modded to work on the 20. It might be your only way out...
[Only registered and activated users can see links. ]
Good luck with it...
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