What exactly do you want me elaborate on? Concering testing patched 37xx bootloader by loading a special boot.bin?
That's quite easy. I'm pretty sure that bootloader on 37xx is executed from RAM. So we could replace it with our patched bootloader and execute the patched one without writing it into flash (and thus probably bricking the device). The only duty of that special boot.bin would be rewrite the bootloader in RAM and pass execution to it.
nuvi 24xx and dezl 560 have quite different bootloaders, at least when comparing them as binary files. But we shouldn't care as we can use the original 24xx bootloader with dezl 560 fw_all.bin.
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