Reaching preboot in itself isn't doing anything, so even if your unit is in preboot if you don't start a flash with Updater.exe it will simply take itself out of preboot within a short period.
You need to check some things, I don't have any access to an eTrex at present but if that series retains a copy of gupdate.gcd on the unit it will need to be removed before doing anything otherwise it will try to flash again from that wrong file after the proper firmware has been loaded. In explanation: 'System Software Missing' message means the unit has been flashed with incorrect or corrupted firmware. Try to access Mass Storage Mode. If your unit can't be seen in MSM by PC and it has gupdate.gcd on it you will need to load cure firmware to be able to access MSM. If you can access MSM, either now or after the cure, remove the GCD file and then flash the original firmware [software] as an RGN file using Updater.exe only. If you're not sure, you could flash it with original fw anyway and if it starts to boot but loads firmware again you'll know gupdate.gcd is onboard.
Some reading for you:
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[Only registered and activated users can see links. ]
[Only registered and activated users can see links. ]
[Only registered and activated users can see links. ] [it's for nuvi, but if necessary similar steps are involved to enable you to remove gupdate.gcd]
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and this one should you need it:
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