No detect rtl2832 android 4.4.4 - Nexus 7 Q&A, Help & Troubleshooting

Hello everyone,
first sorry for my english.
I have Nexus 2012 with 3G modem. I had android 5.1.1 witch root and twrp, but was slowly and i made wipe. Then system doesn't work. I decide to install again 5.1.1 via nexus tool kit - tablet work. I connected rtl sdr dongle install sdr scanner - it's working. Reboot tablet and it doesn't work. So i tryed to install android 4.4.4 - and i have the same situation (of course have root) first install and sdr is working, reboot and it doesn't work. I have info " no connected device". Before i made wipe and tablet work slow everything worked fine. I use active hub, connect directly to otg cable - the same problem.
I don't have any idea. Could you help me? Dongle sdr connected to computer work.
Regards
Zbigniew

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Thx, it works, but I wait for a newer version with working USB host...

[Q] Can't Connect to any PC/Possibility to go to stock without USB

Hi guys,
I have a massive problem.
I recently updated to 4.3 rooted etc, after a few days of not using my nexus 7 on the pc I wanted to flash a new rom.
Now my N7 is only shown as an "Unknown Device" in my Device Manager.
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Here is the message:http://i.imgur.com/tgxOeZQ.jpg
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So after flashing to 4.2.2 my N7 was shown as a portable device in my device-manager. I then turned on USB-Debugging to stock+unroot, it was then shown again as a Unknown device, in both modes, USB-Debugging turned Off and On.
So now my question, is there a solution to this? I searched for possibilites to get back to stock without USB but most of them were a bit sketchy or had dead links. Please help me (sorry for my bad english)
Edit:
I just the cable of my old Motorola Defy, and it randomly connects and disconnects(still shown as unknown), so basically I think it is possible that my USB plug is broken(it takes about 6 hours to load the battery which I think might be as well a reason for a broken USB plug).
But to send it back to Google I need to Stock Unroot first so here my problem is again!
greetings

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My Nexus 4 is not recognized via USB at all, there is no connection sound and ist does not appear in the device manager.
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different USB cables which all worked with other mobile devices such as Samsung S3/4/5 mini
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Hello,
i am desperatley in need of a ROM for the 2012 Nexus that supports USB UTG and Charging.
I would be thankfull for every Info with a working Download-Link to a ROM.
Thanks!
I need it too. And I'd like to have undervolting feature. But looks like you should find ROM by yourself and then flash kernel with OTG+power
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See https://forum.xda-developers.com/nexus-7/development/rom-lineageos-14-1-nexus-7-2012-t3530261 for download and installation info.
I am also looking for a way to use a music player from usb/powered usb hub/fat32 60G card in dash car mount.

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