Tegra Note 7 5.1- How Do I Downgrade From Lollipop?

[SgtEnigma]

How do I downgrade from Lollipop?

So I remember my excitement when I saw that my beloved Tegra Note 7 showed me that the 5.1 OTA is available. Needless to say, the excitement died down after a week or so of using the tablet. The problem that bothers me the most is battery drain. In just about 10 hours in standby mode with WiFi off, my battery reduced 13%. I take it off the charger at 100%, WiFi on, in standby mode and viola, in 10 minutes, 3-4% battery drain with no activity at all. Now I hardly get more than 2-3 hours of activity out of it but when I was using Kitkat, oh boy. 2 days in standby with WiFi off and 1-2% battery loss.....Amazing. Also, I miss the power control so much <3 (I really don't think the Activity Launcher way to get the SHIELD Power Control Menu works at all)

Now I really want to downgrade it to Kitkat but have absolutely no clue how to do so. I'm not rooted currently and I've tried searching in the forum for existing topics for but couldn't find any. It'd be great if someone wrote a 'For Dummies' guide as to how to downgrade from Lollipop on an unrooted device in the simplest way possible.

 

[swaaye]

Yeah Kitkat is better than Lollipop at the moment. You need to get a custom recovery on it and flash one of the stock ROMs. You don't actually need to root Android for any of this.

The "Super Tool" will get the custom recovery on it (CWM or TWRP). Note that you will lose all data on the tablet when you unlock the bootloader. Also, the NV USB drivers for Windows are unsigned and so you will probably need to boot Windows into a mode that disables the driver signing check (Win8/10).
http://forum.xda-developers.com/showthread.php?t=2627654

Then you can put one of these stock ROMs on a SD card and flash them within that recovery. It's very easy to go between ROMs this way.
http://forum.xda-developers.com/showthread.php?t=2777254


And of course be warned that there is always the possibility that something could go horribly wrong and kill your tablet. It went smoothly enough for me though.

 

[SgtEnigma]

Back to KitKat! (+Easy guide for others!)

Thanks a lot for the help swaaye!

I'm finally back on 4.4.2 and damn, the amazing standby times are back. I'm not so sure how I feel about the screen on time as I was expecting more since I've kinda forgotten how KitKat was originally. Anyway, a run time of 1 Day and 12 hours with WiFi on 75% of the time and a screen on time of 2.5 hours is miles miles miiiiiiiiles ahead of Lollipop! (22% Battery remaining). I'm back to the Antutu benchmark of 35K vs Lollipop's 40K/40K+ I'm mad for theoretical performance so I kinda miss that having those beautiful numbers flash on my screen. Regardless, I'll take much much better battery life over those 'numbers' any day of the week. Enough time wasting, lets get on with the guide! (I'm sure this has been posted before but I'll try to cover 1-2 of the issues that I encountered that others might too)

STEP 1 - Download Nvidia Tegra Note 7 Super Tool 2.5.zip (Android 4.4.2) I downloaded version 3.0 but that only restored to Stock 5.1. I'm not sure about the versions between 2.5-3.0 as I randomly downloaded 2.5 and it worked so I didn't bother checking the others for Android versions/software changes.

STEP 2 - Go to Device Manager -> Go into the properties options of the Tegra Note (Right Click) -> Hardware -> Properties -> Hardware -> Driver -> Update Driver -> Locate Drivers Manually -> Locate the folder MicrosoftWindows_NvidiaUSBDrivers_Rel20131017 in the extracted folder of the downloaded Super Tool 2.5 -> Include SubFolders and viola! The software should now be installed. [I’M NOT ENTIRELY SURE IF OPTION 1 IN THE SUPER TOOL– ADB & FASTBOOT DRIVER INSTALL DOES THE SAME THING SINCE I INSTALLED MY DRIVERS MANUALLY. ALTHOUGH, I THINK IT SHOULD DO STEP 2 BY ITSELF]

STEP 3 - Just unlock your bootloader and restore to 4.4.2 with the help of this video (youtube. c o m /watch?v=oAp-P-yUSaA)

P.S. - Thanks a lot for the amazing work to RootJunky and all others involved!

 

[arunbiju969]

Hey which tn7 are you using could you please specify the vendor and the model number

 

[Donz7733]

Hey which tn7 are you using could you please specify the vendor and the model number

I downgraded my XOLO Tegra note - p1640 model using supertool. The process went smoothly.

 

[Eberius]

Do you think it will work on cherry mobile TN7 too? Thanks.

 

[arunbiju969]

Do you think it will work on cherry mobile TN7 too? Thanks.

Yes it works

Sent from my TegraNote-P1640 using XDA-Developers mobile app

 

[@shok]

Steps to downgrade Xolo tegra note 7 from 5.1 to 4.4.2

I downgraded my XOLO Tegra note - p1640 model using supertool. The process went smoothly.

I am new in this forum and has never upgraded or downgraded OS on my own. Can you please help me by writing steps or short guide on how to downgrade with links from where to download the OS and other stuffs required to do it. Thanks in advanvce

 

[arunbiju969]

I am new in this forum and has never upgraded or downgraded OS on my own. Can you please help me by writing steps or short guide on how to downgrade with links from where to download the OS and other stuffs required to do it. Thanks in advanvce

1)Download This zip file from here
http://rootjunkysdl.com/files/Tegra... Tools/Nvidia Tegra Note 7 Super Tool 2.7.zip

2)Open the .bat file form a windows PC

3)Now on your TN7 boot into fastboot mode and connect it to the pc

4)From the option there unlock your bootloader

5)After unlocking the bootloader

6)select the option to Revert back to stock KitKat 4.4

7)You should be now on KitKat

If don't know any of the stuffs I mentioned I'm ready to help

 

[sako_1930]

can someone upload lollipop firmware pls i cant download from rootjunkys download site i don`t know the links are broken or my region didn`t have access to them

 

[russy23]

ive just won a tegra 7 online, what is the best rom to use for this, ive seen all the complaints about lollipop is this still the case cheers

 

[jaaredchl]

help me pls

Thanks a lot for the help swaaye!

I'm finally back on 4.4.2 and damn, the amazing standby times are back. I'm not so sure how I feel about the screen on time as I was expecting more since I've kinda forgotten how KitKat was originally. Anyway, a run time of 1 Day and 12 hours with WiFi on 75% of the time and a screen on time of 2.5 hours is miles miles miiiiiiiiles ahead of Lollipop! (22% Battery remaining). I'm back to the Antutu benchmark of 35K vs Lollipop's 40K/40K+ I'm mad for theoretical performance so I kinda miss that having those beautiful numbers flash on my screen. Regardless, I'll take much much better battery life over those 'numbers' any day of the week. Enough time wasting, lets get on with the guide! (I'm sure this has been posted before but I'll try to cover 1-2 of the issues that I encountered that others might too)

STEP 1 - Download Nvidia Tegra Note 7 Super Tool 2.5.zip (Android 4.4.2) I downloaded version 3.0 but that only restored to Stock 5.1. I'm not sure about the versions between 2.5-3.0 as I randomly downloaded 2.5 and it worked so I didn't bother checking the others for Android versions/software changes.

STEP 2 - Go to Device Manager -> Go into the properties options of the Tegra Note (Right Click) -> Hardware -> Properties -> Hardware -> Driver -> Update Driver -> Locate Drivers Manually -> Locate the folder MicrosoftWindows_NvidiaUSBDrivers_Rel20131017 in the extracted folder of the downloaded Super Tool 2.5 -> Include SubFolders and viola! The software should now be installed. [I’M NOT ENTIRELY SURE IF OPTION 1 IN THE SUPER TOOL– ADB & FASTBOOT DRIVER INSTALL DOES THE SAME THING SINCE I INSTALLED MY DRIVERS MANUALLY. ALTHOUGH, I THINK IT SHOULD DO STEP 2 BY ITSELF]

STEP 3 - Just unlock your bootloader and restore to 4.4.2 with the help of this video (youtube. c o m /watch?v=oAp-P-yUSaA)

P.S. - Thanks a lot for the amazing work to RootJunky and all others involved!

bro i did all that you said, but when i go to unlock de bootloader , he say me waintig for devices, i alredy update my drives everything! but i cant unlock my device, when i entered to booloader mode in the screen say " device-locked" i have to unlocked my device to can unlock the bootloader but i dont know how :c can u help me pls?

 

[jaaredchl]

when i go

Thanks a lot for the help swaaye!

I'm finally back on 4.4.2 and damn, the amazing standby times are back. I'm not so sure how I feel about the screen on time as I was expecting more since I've kinda forgotten how KitKat was originally. Anyway, a run time of 1 Day and 12 hours with WiFi on 75% of the time and a screen on time of 2.5 hours is miles miles miiiiiiiiles ahead of Lollipop! (22% Battery remaining). I'm back to the Antutu benchmark of 35K vs Lollipop's 40K/40K+ I'm mad for theoretical performance so I kinda miss that having those beautiful numbers flash on my screen. Regardless, I'll take much much better battery life over those 'numbers' any day of the week. Enough time wasting, lets get on with the guide! (I'm sure this has been posted before but I'll try to cover 1-2 of the issues that I encountered that others might too)

STEP 1 - Download Nvidia Tegra Note 7 Super Tool 2.5.zip (Android 4.4.2) I downloaded version 3.0 but that only restored to Stock 5.1. I'm not sure about the versions between 2.5-3.0 as I randomly downloaded 2.5 and it worked so I didn't bother checking the others for Android versions/software changes.

STEP 2 - Go to Device Manager -> Go into the properties options of the Tegra Note (Right Click) -> Hardware -> Properties -> Hardware -> Driver -> Update Driver -> Locate Drivers Manually -> Locate the folder MicrosoftWindows_NvidiaUSBDrivers_Rel20131017 in the extracted folder of the downloaded Super Tool 2.5 -> Include SubFolders and viola! The software should now be installed. [I’M NOT ENTIRELY SURE IF OPTION 1 IN THE SUPER TOOL– ADB & FASTBOOT DRIVER INSTALL DOES THE SAME THING SINCE I INSTALLED MY DRIVERS MANUALLY. ALTHOUGH, I THINK IT SHOULD DO STEP 2 BY ITSELF]

STEP 3 - Just unlock your bootloader and restore to 4.4.2 with the help of this video (youtube. c o m /watch?v=oAp-P-yUSaA)

P.S. - Thanks a lot for the amazing work to RootJunky and all others involved!

i do that but when i go to unlock the bootloader the program say me " waiting for devices" i tried with the method "fastboot oem unlock" but here say me " waiting for devices"