[Q] Galaxy S2 - Unknown USB Device - Device Not recognized

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Disclaimer:
I've searched all over the forum and found few close to my problem but this seems different

Background:
I recently flashed my Galaxy S2 International version with CM9 nightly build. Since then, when I turn off the phone and put it for charging, the battery charging animation stays like that till the phone is fully charged unlike the stock ROM where that animation disappears after some time.

Simultaneously I've noticed something else, when my phone is plugged to USB cable attached to my computer, a pop up appears at the bottom right (notification area) which says "USB Device not recognized" and in Device Manager it's listed as "Unknown Device"

I ignored it thinking that it might be an issue with the CM9 Build as it's not fully functional. I've had the phone that way for around 10 days.

Recently I thought of switching to XXLPQ(Official ICS Update) and I got into Download Mode but Odin doesn't see the phone. No "communication" establishing between phone and computer.

I also had CM7.1 on SD Card and I thought flashing that old CM might bring my USB functionality back.

So got into ClockWork Mod Recovery and flashed it. Flash was successful. But now phone is in boot loop with "Samsung Galaxy S2" with an exclamation.
If I try to press and hold the power button, it comes back to that battery charging screen even though phone is not plugged to either USB or charger.

I can get into download mode(Odin can't see the phone) but not into Recovery Mode.
Three things that I see as of now on my phone are the boot loop I mentioned above or Download Mode (but not recognized by Odin) or Battery Charging animation.

I'm sure there's nothing wrong with USB Cables or Drivers or Kies or anything else. Because my brother's S2 works just fine which is on "Stock ROM".

I need help. I'm sure that CM9 nightly broke that basic USB Device functions on the phone.

Please let me know if there is any alternative for recovering my S2. I know that the worst is, it goes to Repair Center.
But I hate to give up on this!!

Are there any other tools or recovery softwares which can be used to re-flash the phone other than Odin no matter what screwed up state the phone is in!?

Deleted - sorry, hadn't read your post properly.

firstly i want to ask does your phone charges? if it does it sounds like u dont have development option enabled.. or ur usb port is broken.. if it doesnt charges then im pretty sure ur usb port is broken...

about the recovery.. can u use ur SD card on ur brother's SG2 and put stock rom into it? and then insert it into ur SG2 and try flashing it throught CWM

Originally Posted by warrez

firstly i want to ask does your phone charges? if it does it sounds like u dont have development option enabled.. or ur usb port is broken.. if it doesnt charges then im pretty sure ur usb port is broken...

about the recovery.. can u use ur SD card on ur brother's SG2 and put stock rom into it? and then insert it into ur SG2 and try flashing it throught CWM

Thanks for the response Warrez!

- Phone charges (but that battery charging logo stays like that)
- When I flashed CM9 nightly I'm sure I haven't checked or played with Development option (It's not enabled)
- And last, I'm not able to get into Recovery Mode as well (already mentioned above)

Any other inputs!?

I have the EXACT same problem

Me too exact same problem .

I've confirmed my setup is fine as it works with Odin for my tab 7.7

Exact same issue, stuck at Samsung logo with exclamation mark. Can't get into recovery, can get into download but computer says device not recognised .

I was running Slim ics at the time then about to switch to cm9 and siyah kernel

Originally Posted by crunchie-uk

Me too exact same problem .

I've confirmed my setup is fine as it works with Odin for my tab 7.7

Exact same issue, stuck at Samsung logo with exclamation mark. Can't get into recovery, can get into download but computer says device not recognised .

I was running Slim ics at the time then about to switch to cm9 and siyah kernel

I was using Siyah kernel too. hmmm

It doesnt look good

Originally Posted by crunchie-uk

Me too exact same problem .

I've confirmed my setup is fine as it works with Odin for my tab 7.7

Exact same issue, stuck at Samsung logo with exclamation mark. Can't get into recovery, can get into download but computer says device not recognized .

I was running Slim ics at the time then about to switch to cm9 and siyah kernel

Well.. I made some progress in last few days! I've taken out the battery and got into Download Mode. I was holding buttons and my brother inserted the battery. What I did was I powered of the system and connected the phone while it was in "Download Mode". I waited for some time.. Say more than 3-4 mins.
Rebooted my PC and once it's back it wasn't saying anything. For my surprise I see the "Yellow COM" established in Modem. Without delay I grabbed recovery ROM which is posted in one of the sticky threads. Flashed the phone.

Now, it got little interesting! When the phone is booted back post flashing it shows that "MTP Device" even though USB Cable isn't plugged into it!

When I turn off the phone, it either reboots back without hesitation or ends up at "big green battery charging" animation!

To get back into OS, I have to get into recovery mode and then I use "Reboot System"!

And that "USB Device malfunctioned or not recognized" thing is intermittent.
At times it says that and at times it establishes "COM connection" in Odin.

I re-flashed old bootloader thinking that it might be a phone's basic operating driver issue. But that didn't solve the issue!

I've even flashed latest stock European ICS Firmware.

And with ICS, things got even more interesting!

It started throwing up new message "Charging Paused due to over voltage"

What I'm sure of is.. It's definitely got to do with CM9 ICS. Because when I was on beta official ICS before I switched to CM9 Nightly phone was working like a charm! As soon as I flashed CM9 Nightly, I started getting that "USB Device Not recognized" issue with the battery irregularities.

I wasn't sure how I could get the phone recognized in Odin. Hastily I flashed CM7.1 on CM9 compatible ClockWorkMod Recovery enabled Kernel. That is when the problem got more complicated!!

I'm about to give up and pay someone to fix it via Jtag.

I've tried several computers, several cables , multiple reboots and everything else.

Windows just still says usb device not recognized so the phone must be corrupted somewhere.