[Moto Z2 Play  Questions & Answers] elios2580:
Hi everyone I have some questions if here in the forum we can solve them together

Without offending or underestimating the work of forum members and the people I have quoted, I only try to find solutions​

I have the Chinese version of the Motorola Z2 Play Model XT1710-11, so I wanted to remove the default firmware with ZUI!. by 7.1.1_NZS26.71-36

First try Unlocking the bootloader to work clean following the steps of many sites who recommend working with the unlocked bootloader But unfortunately when I tried to unlock it, it told me a message "BAD KEY", Look for this type of problems in the forum and other sites, according to the problem is because the supplier who I buy it in China, should give me the key, since it is likely that the seller has changed it. Unfortunately the seller does not answer me and I do not think he does.

1. So the first question is: Is it possible to do the flash even if you have this kind of problem?

First I use this command as the flash comes, blocked from the factory by the supplier:

First of all make a backup of the firmware, and all the elements with the TWRP here: https://xdaforums.com/z2-play/development/twrp-3-2-0-0-moto-z2-play-albus-t3715660

Thanks to @Junior Passos , for his post, who helped me to do it, and in case someone has this phone model with the same "BAD KEY" problem. and be afraid of damaging it, it was tested and it worked normally.

The first problem in my head was that I did not like the operating system that brought by default my Z2-XT1710-11, because even if it was in Spanish or English there were places in the Chinese system

So, what I wanted was a clean and operable nougat.

I started looking for this exact model on the Internet and in the forum, I did not find a specific topic of this model, but in the comments of someone who had it, its name is: @LunaTheLuminous Who had a problem with their modems, https://xdaforums.com/z2-play/help/fastboot-xt1710-11-china-mobile-modem-t3801969.

I did not have a modem problem because I had done backup, but I wanted to try to get to a clean rom and try to flash with comments from @KirMit from here: https://xdaforums.com/showpost.php?p=76813587&postcount=3. Unfortunately there were not the exact commands that he use, for avoid some kind of brick in my device.

Then I continued looking for the same model, and I found something similar that I decided to try : https://xdaforums.com/z2-play/development/moto-z2-play-stock-retail-xt710-07-t3669668. The original idea is to try to get a clean Nougat, According to @KirMit he managed to get a Clean nougat by using Two ROM, which I do not know From Here: https://xdaforums.com/showpost.php?p=74833568&postcount=17.

I tried to find a clearer solution, because I had doubts about the exact commands that I use and roms, below in the comments, KirMit explains: that "the best manual is in the post" . I decided to use the @lexie90 tutorial https://xdaforums.com/z2-play/development/moto-z2-play-stock-retail-xt710-07-t3669668 Thanks :) with this ROM: "ALBUS_NPSS26.118-19-4_cid50_subsidy-DEFAULT_regulatory-DEFAULT_CFC.xml"

and These commands:

NOTE: The commands that are In red do not use them, I put them to see, the commands that I use and the ones that you do not have to use

Here I found a problem, because the bootloader has "BAD KEY" I can not close the OEM LOCK, and in the stage of flash recovery and flash boot it showed this message:

The flash of the firmware was made, I could go to the Nougat, Stock Running the modem, fingerprint reader, but when I turned on the phone I got a "bad key error message", looking for this type of problem is that the "logo.bin" file was necessary flash it, Unfortunately I could not find the original, but in the forum there are several people who have made their own logo.bin as: https://xdaforums.com/moto-z/themes/logo-bin-to-remove-unlocked-warning-n-t3757030, and https://xdaforums.com/moto-z-play/themes/logo-bin-t3538153 Thanks to @TobiPeter and @flashallthetime .

But when trying to flash it, and since they were from z play, the screen did not look good, therefore after several tests to eliminate this message:

[IMG="BAD KEY MESSAGE"]https://forums.lenovo.com/lnv/attachments/lnv/230/6035/1/IMG-20170528-WA0015.jpg[/IMG]

To delete the message, from the motorola z2 play MODEL: XT1710-11, I did a flash with the logo that I made in the backup of the twrp.

https://drive.google.com/open?id=1OjPxy5k02MrH73SXZoXjI1sZCp83uFAr

With this command:

2. My question is is there any way to make a flash clean and to install normal without any error with this type of BAD KEY problem?

But I did not just try that Rom, try several Stock Roms which I present to you in this list:

Also try to change the command to try to see if there was the error, and use these: https://xdaforums.com/z2-play/how-to/close-bootloader-lineageos-losing-imei-t3769479, Thanks to @Kacike27 , Always avoiding:

In the ROM of China I decided to make a full flash using all the commands, as @KirMit said in one of his comments.

Unfortunately I did not succeed the result was the same "bad key" errors and commands ("Image signed with key bad key", FAILED) Etc.

But as you will understand, I was not satisfied with the fact of all these mistakes, which were presented to me along the way, so I decided to do an update to OREO of both version ZUI!!!, and Stock of rom 7.1.1 ALBUS_NPSS26.118-19-4.

Then I followed the instructions in this post by @HTCDevil https://xdaforums.com/z2-play/how-to/fastboot-rom-oreo-retail-via-fastboot-t3786153 Thanks!!!

I followed the following commands:

Following the advice of KirMit, I do not use the commands that are in red

The process that I did for fastboot, it did not work for me, unfortunately the same mistakes appeared in the previous roms, I have to add that when updating to Oreo, in both versions, ZUI and 7.1.1 (Stock ALBUS_NPSS26.118-19-4.), the fingerprint reader stopped working.

The device, started to "encrypt", when I wanted to downgrade to 7.1.1 ALBUS_NPSS26.118-19-4 or ZUI!!. In the command stage:

The commands were throwing error, (failed), now the question is:

3.It is possible that I can not flash the Bootloader, nor do the gpt partition, because the device is encrypted or has the oreo bootloader

?

To finish I try to flash with RSD Lite, without any result, due to the error when it goes in :"fastboot flash partition gpt.bin", it can not execute the flash in the gpt, it stays stuck in that stage.

The testing of RSD lite was with the help of the following post:

end of the tests,

sorry for my English. greetings friends