The biggest mistake people seem to make with JTAG is the “wipe everything and reflash bootloader” ( CFE for broadcom devices) approach they either can't find the correct CFE version after wiping the device, or they reflash with a CFE which is incompatible with their device. While the JTAG can technically be used to watch every instruction and register as the system boots, the recovery software only uses it for DMA access to the flash chip, making it somewhat a blind recovery mechanism. It's one of those amazingly useful things that allows you to recover from pretty much anything that doesn't involve a hardware failure.
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