[Android Q&A, Help & Troubleshooting] kennyTSV:
'samsung mobile MTP Device' pop-ups

Hi SilentShadow..... thanks for your post. In my case, I am totally certain that the issue is on the phone/device side (in my case that is). In my previous post, I mentioned that a factory reset resolved the KIES connectivity issue. The computer side (kies, drivers etc) remained untouched. Prior to the factory reset, the connecting of the phone to a usb jack (while Kies is running on the PC) resulted in KIES recognising that a device had been connected, and pop-ups saying 'Samsung MTP device found', but KIES kept indicating 'Connecting' - and remained like that. This is all with 'USB Debugging' disabled. But nothing worked anyway regardless of USB Debugging being disabled or even enabled. The USB communications was working through, because I was able to link the phone to the computer via normal USB mode (ie USB communications ok, but just not connecting to KIES).

Now, as soon as I did a factory reset, I then noticed that the phone could link up with KIES without any problem. So in my case the issue isn't on the PC side. Also, I used TWRP to back-up the entire data+system+boot. And the KIES connectivity issue resurfaced when I did a RESTORE of the backed-up system (ie data+system+boot).

However, I do know that KIES is able to connect to my phone if I use a FRESHLY ROOTED (unrestored system) stock ICS ROM - because I once used KIES to put KIES backup data onto a freshly rooted ICS ROM system. The connectivity issue occurred after doing a TWRP boot+system+data backup, and then immediately restoring the backup (for testing). I'm not too concerned about not being able to connect to KIES anymore though, and just wanted to add this information in case anybody else runs into similar situations. I myself once wasted about 3 days messing around re-installing stuff drivers, KIES etc on the PC - while the issue had actually been the phone side. I have also read on the net 1 or 2 posts that reported a factory reset resolved the KIES connectivity issue. This is for rooted/unrooted stock ROMS that is.

Once I get time, I'll flash a stock ICS ROM to my second (spare) 9210T and root that one again. Then will test KIES connectivity. I know it will connect. And then do the TWRP backup and restore. And then see what happens. I will do the same thing maybe once more after that. This is all to get a better of idea about the situation.

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UPDATE : SOLVED!!!!!

I finally found a solution to fix the KIES connectivity issue for cases where the trouble is with MTP communications on the PHONE side (not the computer side) when running stock (both rooted and unrooted) ICS ROM. This is for cases where MTP communications (eg with KIES) was working properly before, but then suddenly not working after a hiccup in the phone, such as after a data restore operation (or something else).

The solution comes from just 1 or 2 sources on the net. The procedure is firstly to disconnect usb cable (if any) from phone, then go to the phone dialing keypad screen, and then enter exactly this code *#7284#

So that's 'star hash 7284 hash'. Then just wait for say 5 to 10 seconds until a PhoneUtil screen pops up in the phone's display. There will be a region that says 'USB' with 2 check boxes. The PDA checkbox (under the USB heading) will already be ticked, and that checkbox is the correct one. But what we need to do is to temporarily select the MODEM checkbox, and then select PDA checkbox again. In other words, we just temporarily set the USB setting to MODEM and then back to PDA again. I suspect this re-initialises MTP communications in the phone. After doing this, just connect the phone to the computer again via USB, and KIES connectivity will likely be restored again. I reckon that the KIES connectivity issue might have been a real pain in the neck for a lot of people out there. This should sort it out. This changes my impression about KIES as well, as I reckon that the KIES software is often not the problem.....although I do know that KIES has a problem with restoring CALL LOGS, but restores most other things quite nicely. I have started to use TWRP backups as well (and highly recommend having a second/spare phone to ensure that the RESTORE works, or at least have a MD5 verification utility to verify that the integrity of the backup files). Very importantly, I noticed that TWRP RESTORE does NOT restore the DCIM (camera photos), so need to watch out for that kind of thing.