[Windows Central Question]

I have lumia 820 of windows 10 mobile-downgrade to wp8.1-now upgrade to wp10 but dont-windows advisor error not suppurted-i have developer account-please help me-i want lumia 820 of wp10

[belodion]

Are you saying that you wish to return to 8.1? Or to upgrade to 10?

[BluWarrior]

The Lumia 820 can no longer be upgraded to Windows 10 Mobile even with a developer or insider account. Only these phones can run Windows 10 Mobile officially as of now (all older un-supported devices lost the ability to update without a reg hack about a week ago):

Alcatel OneTouch Fierce XL
BLU Win HD LTE x150e
BLU Win HD W510U
BLU Win HD LTE X150Q
BLU Win JR x130e
Lumia 430
Lumia 435
Lumia 532
Lumia 535
Lumia 540
Lumia 550
Lumia 635 (1GB)
Lumia 636 (1GB)
Lumia 638 (1GB)
Lumia 640
Lumia 640 XL
Lumia 650
Lumia 730
Lumia 735
Lumia 830
Lumia 929 (ICON)
Lumia 930
Lumia 950
Lumia 950 XL
Lumia 1520
Mouse Computer Madosma Q501
Xiaomi Mi4

[Chintan Gohel]

I have lumia 820 of windows 10 mobile-downgrade to wp8.1-now upgrade to wp10 but dont-windows advisor error not suppurted-i have developer account-please help me-i want lumia 820 of wp10

you can't get back to W10M: Windows 10 Mobile Insider Preview Device Reminder - Microsoft Community

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