I've tried to flash my nuvi 2598. The updater starts, saying it's erasing software and after a few seconds there comes a window saying "error in the software" ( see attached image ). I tried the same on an XP machine with older hardware, got the same message. Thank you for your help!
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I'm sorry, I just figured out that I did the wrong thing to enter preboot mode. Now everthing works fine, thank you!