I've just notice this when re-reading post #1: ".... with car charger it still powers down.". That's not typical behaviour with cure firmware loaded. Maybe it isn't a physical hardware problem however that symptom isn't totally indicative of a soft-bricking merely due to a bad file. However perhaps it had an inappropriate formatting. Also, would you explain your mention of "(Ver 4.00)" in your first post, didn't you use V5.50 to make the cure fw?

I suggest you try another FAT32 format with RMPrepUSB, carefully ensuring the check boxes and radio button settings are as follows:


Nuvi 3597LM Shutdown after Garmin Logo

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After successful format, add at least an empty Garmin folder or the files i supplied and then load original V5.50 fw to see if it performs properly.
B1ng0 Reviewed by B1ng0 on . Nuvi 3597LM Shutdown after Garmin Logo Hello, I have a Nuvi 3597lm shutting down after Garmin logo is shown for 3 secs both with Car charger and Computer connection. Installing cure firmware (Ver 5.50) allows the device to stay on when connected to the computer and internal storage is accessible (Ver 4.00), with car charger it still powers down. After flashing with cure firmware(v5.50) I ran rmprepusb and formatted the internal storage(after backing it up) and then flashed original Firmware (v 5.50). After that it goes back to Rating: 5