Preflash Validation failiure Moto Z-Downgrade - Moto Z Questions & Answers

Hi, everyone i have a moto z xt-1650-03 running Android 7.0, i have problems with the wifi & bluetooth. So i try to install ROM STOCK Android 6.0 but in mode fastboot says: Prevalidation Flash Failure Downgrade, but i have bootloader unlock
help please thanks

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Broker99 said:
Hi, everyone i have a moto z xt-1650-03 running Android 7.0, i have problems with the wifi & bluetooth. So i try to install ROM STOCK Android 6.0 but in mode fastboot says: Prevalidation Flash Failure Downgrade, but i have bootloader unlock
help please thanks
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You cannot go back to 6.0 because the bootloader is now for 7.* I would advise you to flash stock 7.0 again and follow the upgrade path to 7.1.1 found here:
https://forum.xda-developers.com/moto-z/how-to/how-to-update-to-official-7-1-1-moto-z-t3640298
Alternatively, you could flash a custom ROM. If you use Moto Mods then you can flash Resurrection Remix with Mods support.

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lollyjay said:
You cannot go back to 6.0 because the bootloader is now for 7.* I would advise you to flash stock 7.0 again and follow the upgrade path to 7.1.1 found here:
https://forum.xda-developers.com/moto-z/how-to/how-to-update-to-official-7-1-1-moto-z-t3640298
Alternatively, you could flash a custom ROM. If you use Moto Mods then you can flash Resurrection Remix with Mods support.
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No, it does not work in the configuration wifi says: Disabled when i try to power on make a infiniti loop trying power on, also the mac adress says: 00:02:00:00:00 because i try install stock rom 6.0

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Broker99 said:
No, it does not work in the configuration wifi says: Disabled when i try to power on make a infiniti loop trying power on, also the mac adress says: 00:02:00:00:00 because i try install stock rom 6.0
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Yes I know. You must flash stock 7.0 firmware. Can you get into the bootloader?
If your phone is bricked then use this
https://forum.xda-developers.com/moto-z/how-to/guide-how-to-unbrick-moto-z-hardbricked-t3590133

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No the pone is no bricked, but i try install 7.0 it does not work see this SS
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res

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Broker99 said:
No the pone is no bricked, but i try install 7.0 it does not work see this SS
res
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It looks like you did an incomplete fastboot flash.
It is a long and tedious process but here is a windows batch file that automates it:
https://drive.google.com/file/d/0B3gcDbDvV4Mkc1JJR0J3ZWh6a3M/view?usp=drivesdk
Another solution is to flash this https://forum.xda-developers.com/moto-z/development/rom-erfanrom-flashable-zip-t3646962 in TWRP DO FULL WIPE FIRST

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lollyjay said:
It looks like you did an incomplete fastboot flash.
It is a long and tedious process but here is a windows batch file that automates it:
https://drive.google.com/file/d/0B3gcDbDvV4Mkc1JJR0J3ZWh6a3M/view?usp=drivesdk
Another solution is to flash this https://forum.xda-developers.com/moto-z/development/rom-erfanrom-flashable-zip-t3646962 in TWRP DO FULL WIPE FIRST
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I flash with u batch, but not working then i flash with twrp not working too i think is a problema of hardware

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Broker99 said:
I flash with u batch, but not working then i flash with twrp not working too i think is a problema of hardware
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I see that you are posting on the other thread. What is the truth?

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You need to flash the modem file twice. For some reason it doesn't always flash properly the first time and you need to flash it again. I do recall somewhere somebody mentioning not to use batch scripts to flash as you can miss some flashing issues occasionally. As stated previously, once you are on the 7.x bootloader, there is no way to roll back unfortunately. Try reloading the full firmware through fastboot and make sure you flash the modem twice. I recently had a similar issue on a Moto X Style and I had to flash the modem twice to fix WiFi issues.
Hope this helps.
Ooms