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[Resolved] [Service] Version WW-2.20.40.206

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rekhapiplani IND Level 2 | All posts
ZenFone2 Bug Report
Model: ZE551ML
RAM: 4G
Firmware/APP Version: MMB29P.WW-ASUS_Z00A-4.21.40.352_20170623_7598_user
Frequency of Occurrence: 4GSM
Rooted: No
APP Name: System update
Screenshot:
I am unable to update my ZenFone 2 deluxe Version WW-2.20.40.206.  When I copy and paste new version in phone's internal memory. It doesn't give notification to update.Please help.
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PHL Level 4 | All posts
   This reply is the best answer.   
Hi I see your ROM version is WW_4.21.40.352, I think this is the most up to date official ROM for this phone (Marshmallow Variant). The WW-2.20.40.206 is the latest update for this phone but this is Lollipop.

Are you trying to downgrade to the latest Lollipop? If you just need to update, I guess you are on the last update that ASUS released. Your options are to use a custom ROM (unofficial ROM) or move to another phone brand and model that has the latest Oreo ROM.
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ITA Level 2 | All posts
If you wanna downgrade, have to use specific tool downloadable from Asus support website
Props
TWN Moderator | All posts
Hi rekhapiplani

Good day
Please refer to kenthko's suggestion.
For downgrade,I would suggest to send the phone to your nearest repair center for checkups
http://www.asus.com/support/Service-Center-All-Countries/

Thank you
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