To desolder/solder a flash chip properly you would need a hot air
desoldering station, not every hobbyist has one.
Then you would need a programmer that handles that chip.
I would only attempt that if I had a 1meg flash and planned to
upgrade to a 2meg flash chip.
Jkeys was originally written for north american echostar receivers,
not fta receivers.
I use either skymax1.3 or jtag_up for fta receivers that are jtaggable.
No need to play with .def files and you don't have to ground pin 115
on the sti5518 to erase/write.They are finicky about the operating
system, I use win98 but others claim they work with winxp.
I assume the 600 has a 1meg flash, which the previous programs handle.
You would also need the jtag size firmware to install, preferrably rigged
for the provider you want to watch.