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Is it possible, I assume it should be, to flash the Cool-ers firmware update without using a SD card?
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It may be
possible, but it's really a hacker task. It's probably easier to get an SD card reader/writer that plugs into your computer's USB or RS-232
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Cool-er may have a standard hardware interface on its system board called JTAG. Mobile phones also have these, and they make it unnecessary to run the device operating system to update the firmware or reprogram embedded security data. Unless you have a JTAG programmer and know how to put the data from the flash file into it, this won't help you.
Richard