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Big Big problem - No fastboot with Controller method and pc!!

I try update my nvidia shield tv 2017 but now the System bootloop on Android circles animation (dont start box).
- I try fastboot with Controller but dont work (many, many times)
- I try conect to pc but dont connect device with fastboot
bricked bootloader??
I dont have solutions.... please help.
Sorry my english

Try un plugging the power then plug a USB keyboard in and hold the A and B key and then plug the power back in.

same problem for 3 days, can not enter fastboot mode. my shield is in bootloop

Shot in the dark, but have you tried different USB ports on the computer? I know in my case, some otherwise working ports will not work with the shield. Seems to be very fussy when it comes to which ports I choose. None of my front ports work on this desktop, I have to plug into rear ports in order for my computer and shield to see each other.
Also be sure to use the original cable that came with the shield.

Also make sure USB debugging is on.

Any fix ? Same problem

Have you tried "adb reboot bootloader" in command prompt when the android logo is looping?

I have no Android logo i have no os just twrp and twrp with no access adb and fastboot command dont work on NVIDIA logo

If you put lineage os on a usb stick can twrp read the usb stick? If so, you can install the zip file of lineage with gapps...once that's installed and booted up, you can enable usb debugging in the developers options and fastboot and adb should work again.

Nvidia shield black screen

Hello guys,
My Nvidia shield 2015 (16GB) (not Pro) stopped working suddenly. GOT POWER but BLACK SCREEN.
Yesterday night, I turned off normally like everyday. This morning when I tried to turn ON using the remote, but no power. Unplugged the power cable and plugged back in. I see the power green light but black screen on TV. My shield 2015 is updated to the latest firmware v8.2.0 few months a go.
I want to boot the shield in Fastboot but the command ----> adb devices ---> cannot find my device, I installed the fastboot drivers and minimal fastboot & adb from here (also when I plug the shield to my PC Windows 10 - I see "APX" unknow devices (see attachment APX driver.PNG). I'm using the original nvidia micro usb cable.
[GUIDE] How to flash recovery image Nvidia Shield TV using FASTBOOT hardware method
All of the instructions I found for doing this weren't exactly clear, so I'm writing this out in a way that even dummies like me can understand. So, my Nvidia Shield TV got soft bricked when I tried to update my TWRP to this version. First, you...
forum.xda-developers.com
1) Install FASTBOOT DRIVERS: https://developer.nvidia.com/gameworksdownload#?search=SHIELD Family Windows USB
2) Install Minimal FASTBOOT & ADB: http://forum.xda-developers.com/showthread.php?t=2317790
Also tried the instruction to install the driver by selecting either from Nvidia sheild
- Tried SHIELD_Family_WHQL_USB_driver_201801 --> Select android_winusb.inf --> Tried "Android Bootloader Interface", "Android ADB Interface". See attached "Nvidia How_to_Install_Drivers.pdf"
Android BootloadervInterface" and "
- Tried Universal_Naked_Driver_0.73
- Tried adb-setup-1.4.3.exe
- Tried platform-tools_r30.0.5-windows
Not able to see my nvidia in adb devices.
I followed the proper instruction to put the nvidia in hardware fastboot, as follow: See attached "NVIDIA HowTo-Flash-Recovery-Image.pdf"
"Hardware Method:
- Disconnect power cable
- Connect power cable to SHIELD
- As soon as the green LED turns on -BUT NOT BEFORE- hold down the power button
- Count to three, then immediately release the power button
- You should now see the fastboot menu on the screen.
- If the standard boot process starts, disconnect the power cable and repeat
the process increasing the count in the previous step to 4.
NOTE: You should leave the HDMI TV connected to SHIELD at all times."

Absolutely the same problem here! nVidia SHIELD TV Pro (2015) worked fine about a month ago was turned off normally and wasn't used after that. Several days ago turned it on and nothing except green power light. Stuck in APX too.
Please help!

2020 edition and in the last month or so my 2020 Shield TV 4K HDR is also having issues with the screen blacking out at random times. Tried multiple refresh rates. Plenty of remote actions can restore it until the next random time it blacks out again, sometimes the next minute, sometimes hours later. Happened 6 times in one Youtube video and seemed to correspond with scene changes.
edit: of-course NOW that I post something here, I find search results everywhere.

Can’t select in Recovery Mode

Hello!
I have an iiyama TV (43" (109,22cm) iiyama ProLite LH4370UHB-B1) with android 9.0 pie (TV OS) installed. Something went wrong and the TV is now booting on every reboot automatically in Recover Mode. The problem is I cannot move inside the recovery mode. I cannot go up and down either I cannot select something. There is only one Power button on the TV, I was sure that this button must be for selecting, but no, doesn’t work either, also a USB keyboard connected on the USB port of the TV won’t let me select or move. Anyone an idea? Thank you!!

Hisense U8G Bootloader Unlock (and probably others)

Hello. I have managed to unlock the Hisense U8G bootloader in the stupidest of ways. This will likely also work on the U6G, U7G, and U9G (Android TV models ONLY) since they run the same firmware. This will probably also work on every other Hisense Android TV.
So... tl;dr just run "fastboot flashing unlock" and that's it. No need to enable OEM Unlocking in Developer settings or anything since there is no FRP.
You will need:
A computer with adb and fastboot installed
Mediatek drivers if running Windows
udev rules if running Linux (available here: https://github.com/bkerler/mtkclient/tree/main/Setup/Linux)
Step-by-step on a stock TV OS (YOUR DATA WILL BE ERASED):
Enable Developer Settings by clicking on build number 7 times, standard stuff
Enable USB Debugging (this will also enable network debugging, but you will not need it)
That's all you need to do on the TV itself, settings-wise.
On the PC:
adb devices
On the TV:
Allow USB Debugging
On the PC:
adb reboot bootloader
fastboot flashing unlock
fastboot reboot
That's it. Your bootloader is now unlocked.
I am currently trying to figure out a way to dump boot.img and vbmeta.img and/or get into BROM mode so I can use mtkclient to dump boot.img and vbmeta.img. Help would be appreciated.

Hey. Do you know how to unlock bootloader of Hisense 50A71F, it goes all black when I run "adb reboot bootloader".

jerrydevis said:
Hey. Do you know how to unlock bootloader of Hisense 50A71F, it goes all black when I run "adb reboot bootloader".
Click to expand...
Click to collapse
Thats normal, need a usb type a male to male plugged into 1 of the ports of your tv only 1 port gets detected and other not so ask me for the adb bootloader interface driver for the tv and ill provide, I have a Hisense 43A6H its a MEDIATEK MT9612 SoC which I unlocked the bootloader and cannot root it as I have all the drivers and boot.img and I patched it and typed command and on my tv and likely yours is the same command in slot B but it didn't root the tv...... Anyone know of an alternative method to patch and flash the boot.img? Mtkclient gui might work with python but idk haven't tried yet... Make sure to get the latest firmware from hisense so u can recover if u do something wrong or want to relock the bootloader.
To recover take your .pkg file which for me is update_no_tvcertificate_user.pkg and rename to update_no_tvcertificate.pkg and have only that file on your fat32 flash drive and unplug the tv plug in the flash drive and hold power button on remote pointing at tv and plug in the tv and it'll start recovering and u can let go of the power button.
Code:
fastboot flash boot_b boot.img

Don't freak out if you brick your tv make sure before u do anything to call up Hisense to get your firmware and they will email it to you. I bricked my tv like 3 times but recovered it and im talking to u now on my Hisense 43A6H Google TV Android 11 with a mini wireless keyboard mouse usb 2.4ghz dongle plugged into a usb hub by Sabrent with a 4tb hdd ntfs plugged in and a 400gb sd card fat32 it detects everything. I was gonna make a guide on how to do stuff on our tvs as well its tricky but fun when u succeed.

I've been having a hard time rooting the tv. Nothing takes, may someone help?

chris1892006 said:
Don't freak out if you brick your tv make sure before u do anything to call up Hisense to get your firmware and they will email it to you. I bricked my tv like 3 times but recovered it and im talking to u now on my Hisense 43A6H Google TV Android 11 with a mini wireless keyboard mouse usb 2.4ghz dongle plugged into a usb hub by Sabrent with a 4tb hdd ntfs plugged in and a 400gb sd card fat32 it detects everything. I was gonna make a guide on how to do stuff on our tvs as well its tricky but fun when u succeed.
Click to expand...
Click to collapse
I would be thrilled if I could just get my Hisense to default to HDMI1 input upon startup, like you can with other SmartTVs.

Have a 65H6510G with a failed eMMC. Service port UART shows CPU trying to setup eMMC to retrieve data, fails and repeats. I can replace eMMC but need to flash in signed boot code. Any ideas?

How to select Confirm into bootloader mode.-

Hi!
First of all, sorry if this sounds stupid...
I'm trying to open the bootloader but I'm stuck. I don't know how to select "Confirm". I can't see any buttons and wireless controller doesn't work.
Any help? Thanks for your time.
Nvidia Shield TV Pro (2019)
EDIT: Ok, I found it.
Plugging an USB keyboard BEFORE entering bootloader mode.
Afterwards, unplugging it and using an USB mouse instead into TWRP recovery.