Thanks Neil. Bootloaders were one of the most problematic systems in my work. A microprocessor or controller would use a simple ROM-based loader to open a memory path from whatever interface we used to an EEPROM device, which we then loaded using either JTAG or homegrown SW. We'd often get unrecoverable errors and despite the designers saying 'just reload the FW...' usually it was off to the rework dept for a new EEPROM. Our hi-rel designs thus often had double-or triple-redundant EEPROMs.

On the off chance I can do a chip rework, is your SD card process sufficient to reload the necessary FW to a new EEPROM to at least get me back to GarminCure3? Also, if anybody has the P/N for the nuvi 1390 EEPROM chip, let me know. I'd try this just for the challenge of it. Our new chips always came already 'balled' so it may be possible, if the chip is still available.