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Not entirely sure , what sign in problem you mean but I think you are referring to the Google Account Verification after factory reset on Lenovo TAB-3 7 Essential . To fix this issue you will need to do a "Hard Reset" 

How to Hard Reset Lenovo Tab-3 7 Essential

  1. Hold down the Power key for a short while in order to turn off the cell phone.
  2. Press and hold the Volume Up Power button simultaneously for about 10 seconds.
  3. In order to choose "Clear eMMC" use the Volume Down to navigate and the Power key to confirm.Restore LENOVO TB3-710F Tab3 7 Essential
  4. After the Hard Reset you will not get any account sign in problem.
Hope this will help , if it doesn't we can try other methods aswell
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I did hard reset but same issue.. and with volume + and power button the other window came
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  1. Turn off the Tab.Press Power rocker for a short while.
  2. Afterwards hold down Volume Down + Volume Up + Power button together for about 10 seconds
  3. You have to release held keys when you see the Android Robot.
  4. To enter the Recovery Mode hold down the Power key for a short while.
  5. From the menu choose "Wipe Data/Factory Reset" by using Volume buttons to scroll and Power button to select options.Wipe data LENOVO TB3-710F Tab3 7 Essential
  6. Tap "yes" to confirm the operation if you are certain you want to clear all your data.Master Reset LENOVO TB3-710F Tab3 7 Essential
  7. Finally, use the Power button to accept option "reboot system now".Factory Reset LENOVO TB3-710F Tab3 7 Essential
  8. Try this and let me know 
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did the same. wiped data and factory reset. still asking for old sign in account
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please make an easy way to post screen shot here. tried but its asking for a link.. so i couldn't posted the pic here.

Please make it a bit easy.. :)
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did you erase the eMMC ? if nothing happened , we can go with flashing recovery

You can upload images aswell .. click on the Image icon > Click on Upload Tab > Choose File > Send to Server :)

Also show me the bootloader image
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Its a security step set up by google, one needs to open the google account that was previously used on that device.
The only solition I came upto is flashing a stock rom, or a custom rom may also be used......
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eMMC window doesn't come.. in both ways, recovery mood comes as I uploaded picture
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don't know how to flash... any help?
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are you Pressing and holding the Volume Up Power button simultaneously for about 10 seconds ? it should appear as shown in above screenshot ..share your Bootloader image so i can guide you about Flashing 

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finally able to post picture too... have o resize.. not allowed more than 1mb

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Same window comes Vol up + power & Vol up+Vol Down+Power..
Now how to flash or any other solution Khan sab......

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Select the option "reboot to bootloader" and also show me its image.
Image sizes shouldn't be more thn 1 MB :p anyway you can always use https://img.drhack.net for heavy images and all 

let me know the bootloader image so we start with flashing your Lenovo Tab 3 7 Essential

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this window came
now whats next 

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please add notification type or text to mobile or something to notify about reply.. have to check again again. hope you add something like to make it more easy and .........
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ill write down a tutorial , by evening on how to flash a custom ROM , that way you will be able to get over this google account security feature .. and there is an "email option" when ever someone answers or comments you get an email in your account.
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Thanks, Yes I know about email notification. Beep here would be a good option when page is open.

Do I need any other device to flash or just like recovery/restting with the help of Tab keys only?
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You will need a Computer , USB Cable & your tablet for this process, if you have these things keep on reading.

Flashing Stock ROM on Lenovo Tab3 7 Essential - TB3-710F

  1. Download and extract SP Flash Tool (SPFT).
  2. Download, extract, and install the Preloader USB VCOM driver (cdc-acm).
  3. Download and extract  TB3-710F firmware.
  4. Run the SPFT, load the scatter file that was included with the firmware download.
  5. Make sure that SPFT mode is set to "download only".
  6. Remove the checkmarks from the partitions you do not want to overwrite. In your case, first try to only flash the BOOT/BOOTIMG and SYSTEM/ANDROID partitions (remove all checkmarks except for boot and system).
  7. Click the SPFT download button.
  8. Connect the tablet to the PC via USB. The tablet must be off. If it's running, just shut it down or reboot.
  9. As soon as the tablet's boot process begins, the SPFT should find it and begin the flashing process.
Once done it should not ask for OLD google account.
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stuck here. what to do now. Anything missing or what?

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where I went wrong. or something missing?
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did you select the partitions ? BOOT/BOOTIMG and SYSTEM/ANDROID , also select USERDATA profile ..
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no I didnot select user data..........
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selected. still same window. no movement on the page
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select : BootImg , Android , UserData

following the methods I shared above ..when you plugin in the tab hope it gets detected by your system ? and it should be powered off
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maybe I missed some thing while installing. rest did everything as per your instruction. selected:  BootImg , Android , UserData 

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you shouldn't miss anything .kindly follow it exactly and if you face any errors let me know so we resolve them angel

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I am failure in this task. I did as per the instruction but. Going to give it back to kid.

Complicated to flash. angelangry

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well its not that much , but still the way to do it is "flash a custom ROM or Re flash STOCK Rom" that will solve your issue .. you may learn while trying .still if you don't want to its fine .. you may select the answer so the post is marked as Solved as did provide what all was required.thnks
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what is this message. tried right now and this window came. 
I tried to upload this window from mobile but i couldn't. not mobile supported and please let it more than 1mb to upload to. everytime have to resize than upload :)

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Oh good , you tried again .. this message means your Tablet has a different model version , I will get you appropriate firmware for your Lenovo Tab3 7 Essentials MT6580  . Its weekend so can not tell how quick i will be :P .. and as per Image, as I earlier told you may upload all your images on img.drhack.net :) .and i will increase image size to 2MB 

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In Step 3 of my above comment just download Firmware of your Tablet Model : MT6580 

Once done follow the same tutorial as above and continue. 

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tried to find exact firmware but all the links I found are fake. unable to download. Please give me the downloading link. when you get some free time.
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TB3-710I-S00029-160318-ROW
this is what I need.Model
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Firmware for : S00029 (This should work for you model ) and the download is real

and for update to S00030 with Recovery

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I tried this link to download on saturday. after 15-20% downloading stopped and have to start again from zero. Can't resume it.
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Done this. whats next now.
At least succeeded to this level. whats the next level now :)

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repeat the process , and this time also select "userdata" partition ... and hit download button again ..and make sure the tab is turned off , once its done you should turn on the tab and find it all clean
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"for update to S00030 with Recovery" what to do with this update? have downloaded but not clear what to with it?

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 repeated. still asking for the previously used google account. cryingcryingcrying

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leave the with recovery update for now ..
again do the same but this time SELECT ALL THE PARTITIONS
and let me know what happens
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have checked all the partions. started. will let you know what happen
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Still asking for old google account......................... with all parttions checked
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now this is weird , give this link a glance .. it is same but maybe a difference in explaining might help you a bit ?

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give this ROM a Try :  S00030 with Recovery , and after flashing open its recovery tell me if TWRP has been flashed or not ..

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give this ROM a Try :  S00030 with Recovery , ... how to give it a try. please not clear how to proceed with it.

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you proceed using the procedure as mentioned in this comment , but in Step 3 : use the Firmware S00030 with Recovery .

But be aware of one thing , if you click the download button in SPFT after connecting the tablet, or after rebooting? If you do this IT WILL NOT WORK. 
Click the download button first, then connect the tablet which should be OFF. That's due to the way MediaTek has implemented this..

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Firmware S00030 with Recovery SP flash tool not uploading scatter file of this file.

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go ahead wtih version 29 again , but i will ask again .. are you flashing with your Tablet turned OFF ? and you connect it after you press the "Download" Button  ?
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Yes Sir, My tab is off. First I click download button then I connect Tab and when I connect it Vibrate and process start.
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can you use TeamViewer ? or close it now. Have wasted much of your time
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sadیہ تو آن ھی نہیں ھو رھی اب۔ ڈیڈ ھو گئی ہے لگتا ہے

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email me TV ID and password  on a d m i n [at] d r h a c k [dot] net
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Sent email. TV ID and password  on a d m i n [at] d r h a c k [dot] net

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try this format flash. And I think it has gone mad (Dead) :D
Tried this tab. experiment. Its gone dead now. :D

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Why you Formatted :/ I never asked you too and you weren't suppose to do so ...
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mean its gone dead now. its over now???????????????????????
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Any idea what is the minimum amount to pay to Unlock an IPhone?
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went to a shop and they asked 24k for unlocking it.............
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Yes , but there are very less chances that it might still work as you didn't flash the boatloader .. and you can try flashing the 29 firmware again .. did you try that ?

lets keep this question focused on the main concern .. your other query is not relevant to this, should be asked as a seperate question
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Flash the old 29 firmware, I might have another way for you. If your device gets back on after turning on you might be in for a treat
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No matter device get back on or not. You still deserve a treat. You are welcome for a treat anytime. smileyyes
Let's make the deal final??
And here the new message!

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Hope you doing it while the TAB is off ? 

also after you flash the firmware 29 , Download this Custom TWRP Recovery for your Tab and only select the "Recovery" partition and flash it ..using the same procedure as mentioned above. once down open "Recovery on your Tab" as already mentioned in above comments..if custom recovery opens up their you need to format the partition "frp" that is the "Factory Reset Protection" partition which is storing the Google Account information to prevent misuse .

My treat is getting this damn tab to work :p

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Link not working. It will test both of us :P

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And Tab is off 100%. not only off rather dead
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That is an issue with Android File Host , I have asked them for resolve the "OOPS! - no mirrors found." issue . Its a wait game for now 

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its okay, waiting.................................................!
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Nothing.................................................................................?
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Issue is resolved , you may begin your download from the link given above as download servers error is fixed

image

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Its not letting to check any partiton....  Do we need to add anything in location too?

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Hurrah! Done. Its working now. What process worked don't know. Kept trying and finally succeeded.
Your treat is confirmed once again. smileysmileyyesyesheart

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Well glad it get fixed *eventually*

The best part of trying to help is that I also learn along the way, in your case .

To Reset the Tablet to Format the Factory Reset Protection (which does not show the old google account) is to simply install a Custom Recovery and once that is done , format the frp partition.

You may select the above answer as "Best Answer" so the question is marked as "solved" and it might help others aswell :)
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