[Completed] Can't change firmware Lenovo Vibe Shot Z90-7 - XDA Assist

Hello everyone!
I accquired this phone froma chinese online shop (the third one) and i want to change the chinese rom to euro firmware.
The problem resides in that when i changed the rom following the instructions of this forum in the other 2 previous phones i got it was everything alright and worked correctly, but with this last one i can't even make miflash/qlifil recognise Qualcom Com port. Now i only get at miflash the phone recognised with this weird name: b65bc2d5 . I'm affraid to try flashing because i didn't see anyone who got that name on the program and i don't want to get a brick. Also i tried to change the rom by sdcard with fastboot using the same file i used to install the other 2 phone that worked but it still says that the phone is Z90-7 and it wont take the installation file ( it's the second file on boycracked stock official lenovo vibe shot rom page). The thing is that when you upgrade to eu rom the phone model changes to Z90a40 and takes that rom, but not this last one.
I installed all the drivers manually because the phone on vendor mode can't install them itself (vol up + power button and then plug to the pc).
The version of chinese rom is android 6.0.1.
I hope this info will make someone know the solution because i don't.
Thanks and regards.
P.D: Now i'm triying to plug and detect but can't even do miflash detects it.

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please post your question in our Android Q&A section:
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Hi,
Thanks for writing to us at XDA Assist.
There is no dedicated forum for your device at this time but you may want to ask your question with all relevant details in the friendly general Android Q&A, Help & Troubleshooting forum at http://forum.xda-developers.com/android/help.
Since your device is relatively uncommon, please be patient and give the experts plenty of time to respond.
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Hello and thank you for using XDA Assist,
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Hello and thank you for using XDA Assist,
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Hello and thank you for using XDA Assist,
please create an account and post your question in our Android Q&A section:
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