Sorry, I know it's not my topic and I should create the new but looks like moderators didn't approved it when I submitted a new topic and I have no ability to tell about this.
I have the same problem with continious reboot loop. Standard methods is not worked for me. Problem was appeared after my PSU is overvoltaged my HD500 (approx. 13V-17V instead 9V) and then PSU died. Currently there were two burned resistors, two dead capacitors and one dead quartz. After replacement power circuit is OK, all testpoints on PCB is OK, all power pulsations is OK (digital oscilloscope monitored) but I still have continous reboot.
PCB has LPC2220 onboard and thereis a 14-pin JTAG. Data is going in boot-time but symbols is not readable. I think there is corrupted firmware in 39VF6401B or corrupted EEPROM in 24LC256 and I dumped both chips with chip programmer but I don't know how to unpack this images (or build filesystem and mount?) On the other way firmwares in "Download" section is ~790kb size when 39VF6401B is ~8Mb and 24LC256 is ~256Kb memory size.
Can anyone help me? I need to know how can I get correct data from JTAG and maybe someone has correct dumps for this chips?
Thanks in advance and sorry for my English I'm a student and living in the other country and still learning. And sorry twice if I'm wasting your time but there is no Line 6 service centers in my country so looks like I need to repair it by myself with (or without) your help. Thanks again.