Sony Muteki STR-KM3 (HT-M3) troubleshooting

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Hi all!
Does anyone here know about programming and/or updating Sony AV receivers?
I've got a Muteki STR-KM3 that displays a "USB FAIL" error message right after turning on. Then turns off instantly.
I have already done a reset by pressing the power button for 5 seconds (it displayed "CLEARING... CLEARED").
The most strange thing is that this (Argentina, Thai made) model DOES NOT HAVE a USB port outside (only onboard hardware, but with no cord and no front panel board/adapter).
Thanks. 🙂
 
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Once I fixed the same equipment, but with front USB port/USB hardware.
It displayed the same message, but after a couple of minutes of normal functioning.
I discovered that it was due to a faulty relay (RY901).
After changing that part, everything went fine.
 
Hi all,
After resetting my Sony Muteki STR-KM3, it lost the Tuner option. Using the input selector on the unit does not give me the tuner option though i can get it using the remote control. I have not been able to tune the radio since. Does anyone have a solution for this?
Regards,
James
 
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