how to downgrade HTC d816w from marshmallow to lollipop - Desire 816 Q&A, Help & Troubleshooting

I recently updated my HTC Desire 816 dual sim to marshmallow and I want to get back to lollipop.
So, please can anyone tell me how can I do this?
I don't have root or recovery on it.
Device info:
OP9C700 D816w
android ver. 6.0
software number 3.21.401.1
kernel ver. 3.4.0-perf-gdae268a

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[Q] HTC 816 Help Need

Dear all - I have HTC 816 Duel Sim Mobile.Phone details as follows
Androide Version : 4.4.2
HTC Sense - 5.5
Software Number - 1.0.0.D816
HTC SDK API Level - 5.69
Baseband - 1.13.3230.xxxxxxxx
My Problems -
1) How can I update it to 4.4.4 ? - it Doesn't appear Software Update Menu at all
2) could I able to get Lollipop ?
3) How to find out my phone was Original or Not ??
Please help
It looks like you've got the Chinese variant. if so, you can look it up in the forum, there is a way to update your phone to the latest ROM. no lollipop is available for any variant of 816 yet, but if an update comes in the future, you will most probably be able to use it.
To get lollipop you could flash CM12, but it wouldn't be official lollipop from HTC.
Thanks all My buddies ! :fingers-crossed::fingers-crossed::fingers-crossed:

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update to android lolipop for desire 816g

hi
my device is htc desire 816g mtk6529
i want update it from 4.4.2 to 5.0.2 but i cant success....
buid number:1.13.1136.901
pleas help me...heeeeeeeeeeeelllppp
Please take a look at
this thread

please Help Me

HTC Desire 816 dual sim
android version: 6.0
HTC Sense version: 7.0
my phone's dual sim card Suddenly Out of service
this problem not fix by restart & tern off
my build number is 3.21.401.1
this rom is changed by me a few months ago
please help me changed this rom by best rom for me

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