Hey all,

My old Etrex 20 does not power on.
I connect it to my computer and there it power on and I can see the files.

I tried to reset it but no change..

Will it also power on if connected to an appropriate external power supply? (Other than a computer USB port).

Well, I tried to reupload the firmware using WebUpdater and it works !
It boots normaly, I do not understand what happened..

Likely it just had a corrupt gupdate.gcd firmware file if your problem started immediately after it was last connected to GarminExpress or WebUpdater. By WU re-loading a fresh GCD to overwrite the bad file it's been able to start and then complete the normal boot process. Did you notice a message about software loading on the etrex's screen during the first successful boot?

B1ng0 wrote:Did you notice a message about software loading on the etrex's screen during the first successful boot?

Yes