Release Note

[Resolved] [Service] Version WW-

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rekhapiplani IND Level 2 | All posts
ZenFone2 Bug Report
Model: ZE551ML
Firmware/APP Version: MMB29P.WW-ASUS_Z00A-
Frequency of Occurrence: 4GSM
Rooted: No
APP Name: System update
I am unable to update my ZenFone 2 deluxe Version WW-  When I copy and paste new version in phone's internal memory. It doesn't give notification to update.Please help.
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- 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
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

Thank you
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