how to usb mode arte300 - P3300, MDA Compact III upgrading etc.

plz help me for usb mode this phone

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How to enable USB Debugging Mode Toggle

Hello,
I want to get USB Debugging Mode Toggle..
I have enable USB Debugging Mode From Setting -> Application -> Development and Selected USB Debugging mode...
When i connect my phone to pc.. on notification its show on USB Mass-Storage Mode only but not showing USB Debugging Mode..
How can i get USB Dubugging mode on Toggle.. Plz hellp me
If it connects in mass storage mode, USB debuggin is working.
It doesn't pop up a message "hey, I'm in USB debuggin now", it just does it.
I know on my Galaxy S5 through verizon, I have to keep tapping build number under phone options to enable developers mode and unlock usb debugging.
Why necro a 2.5 yr old thread to say that ?

SPH-L720 Diag mode not working

Hey guys need help getting my phone to connect to PC in diag mode.
My phone will enter diag mode (thru the ##3424#) but my computer won't detect it as a port (in device manager)
I verified that it wasn't the USB cable or my drivers by connecting another phone in diag mode (s3)
Any assistance would be appreciated.
ps I tried the 9090 trick no luck

[Q] SPH-L720 Diag mode not working

Hey guys need help getting my phone to connect to PC in diag mode.
My phone will enter diag mode (thru the ##3424#) but my computer won't detect it as a port (in device manager)
I verified that it wasn't the USB cable or my drivers by connecting another phone in diag mode (s3)
Any assistance would be appreciated.
ps I tried the 9090 trick no luck

[Q] Why Download mode dont working

When i press volume+ and connect phone to usb >> just charging ..
I dont have oryginal USB cable, i use LG Nexus 4 USB cable (maybe that issue?)
What can i do?

note 4 n910a usb not working restart again and again

note 4 n910a after factory reset showing android upgrading app 75 of 258 and restart i want to flash lates stock rom but now usb port not working when i put in download mode and connect with pc nathing hapen in pc. recovery is working download mode working phone only charging in download mode not showing in pc. i did install new samsung usb driver i changed pc but same problem anybody help please how to slove this problem:crying:
i dont knw how to upload pic here plz help with this phone urgent

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