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To downgrade firmware easy method:
Plug nuvi USB, look for garmindevice.xml, change <SoftwareVersion>430</SoftwareVersion> to<SoftwareVersion>280</SoftwareVersion>. Save
Don't unplug nuvi from pc.
Having Garmin Webupdater on pc desktop, drag&drop in it [Only registered and activated users can see links. ] flash firmware.
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Thread: Nuvi 66LM firmware rollback
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22nd April 2015, 01:10 AM #1Important User
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You have to navigate to get to the good.
Galaxy S5 Kitkat 4.4.2 / Nuvi1200->1250 / Nuvi3790T->34xx / Nuvi 2200 / Nuvi 66 / Oregon 600
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24th April 2015, 07:26 PM #2Junior Member
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My GPS has firmware 2.30 . The threads that I have read so far instruct to downgrade from 4.30 to 2.80 or 2.70 . So in my case, my GPS doesn't need a downgrade. So what do I need to do to get my nuvi 57 to read unlocked maps from an SD card? Thanks.
Originally Posted by catymag
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30th May 2015, 11:09 AM #3Junior Member
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Hello.
Can you explain little bit more in details the last sentence : where to drop the firmware exactly & how to flash the firmware
THX
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