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Root Phone infected, Tried everything, nothing worked

Guyz,

I recently lost my samsung guru on my way to office and then I had to switch back the old galaxy i7500 lying around for months. It was still alive and had recently been services(the touchscreen) by the authorized service centre.

I am comfortable with recovery/rom and before sending it to service I had galaxo 1.6(the latest stable back then) on my phone. I even had some(3 to be exact) nandroid backups on my phone. After it returned from the service centre it started acting strange. Now the problem begins.

It looks & works completely fine until I call somebody. Then something just starts running in the background, random keypresses, some random application starts, and I see the volume bar all the time as some continuous volume up command is given, I presume. It just goes on like this during the entire call and even a few seconds after the call. Another problem is it silents my phone every time someone calls me, so no matter what I set in the settings I never ever hear a ring when someone calls me, even the vibration gets off.

Solutions I tried: Obviously I tried formatting the storage(it doesn't have any external storage). Flashing the ROM, changing the ROM, drakaz 2.1, recovery 6.6 etc. Nothing helped, I even tried(with some workaround) and got the old nandroid backup restored . .. but to no avail. I have currently Kaspersky installed on my phone but even it can not detect anything. I have not given odin a try yet as I am on Mac and currently not very comfortable with heimdall.

I must thank you for reading this long post of mine & appreciate any little help any of you can offer, even some sympathy will do.

Thanks in advance,

Abhinav
 
There's not much activity here now. I can't really help you, it's a problem I've never seen before. I don't even know what can cause that, but I doubt it would be a "virus".

At this point you already tried pretty much everything that would have come to my mind.
 
There's not much activity here now. I can't really help you, it's a problem I've never seen before. I don't even know what can cause that, but I doubt it would be a "virus".

At this point you already tried pretty much everything that would have come to my mind.

I understand and appreciate your reply here. Can it be some kernel level thing, you think?
 
The only solution for you is to go back to service center with the phone. I think that it's hardware related error. Let them have a look at it.
 
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