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nuvi 2559 [C4 or not] are really no different than most nuvi models in method to reach preboot but all 2xx9 can be notoriously difficult to work with. Generic instructions are detailed in the link given above by catymag. If the unit's not bricked it's much easier to update firmware from media card or use WebUpdater etc with gupdate.gcd. If you're trying to patch firmware for unlocked maps, there's a kit for SD flashing available in this post: [Only registered and activated users can see links. ]. It's for both HWIDs of 25x9. Just firstly read the edit behind the spoiler and make the region change for the nonvol backup from 41 to 154 in Update.txt file.
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Thread: Garmin devices preboot mode
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20th March 2016, 10:43 PM #1Garmin/GPS Systems GMod.
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22nd March 2016, 04:34 PM #2Junior Member
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Neil, thank you very much! This worked in my 2599 unit. Thank you again for your great help and work!
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6th April 2016, 10:07 PM #3Junior Member
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No luck getting Nuvi 50(LM) into pre-boot. Device was accidently formatted through PC. Pressing top left corner of screen and holding while pressing pwr button. Only get to the Garmin logo. No indication of pre-boot mode success.
Any clues?
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