Windows 10: Lumia 640 3G dual проблемы после обновы!

Lumia 640 3G dual после обновления с 8.1 до 10 постоянно выдает ошибки, например при входе в магазин - ошибка. многие приложения выкидывает, не работают. обновления не хочет больше качать.как сделать откат назад к 8.1?

:)

 

No 3g connection while 2g works (Lumia 640 DS 3G)

I have recently bought Lumia 640 Dual SIM 3G with a cracked display and broken battery connector pin for a bargain price. I replaced the display module and repaired the connector pin, everything works
except for a 3g connection.

What I did (with no result):

• hard reset;
• updated to the latest WP10 build;
• downgraded to the original WP8.1 build with WPID;
• checked ##3282#, all bands are active.

[*]

The SIM-card that supports both 2g/3g works in every slot (in 2g mode only).

The SIM-card that supports 3g only reports 'no service' in every slot in spite of settings.

The SIM-cards are good. The same exact phone fully operates in 2g/3g with these SIM-cards.

I would appreciate any advice.

 

lumia 640 phone update

I have a Lumia 640 dual sim phone which I cannot update through Airtel 3g internet connection. I have no wifi connection. Please suggest how to update my phone without wifi.

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Whether the Microsoft Lumia 640 XL Dual SIM Mobile phone being sold in India has dual wcdma bands or quad wcdma bands

The link for 3G version is at http://www.microsoft.com/en-in/mobile/phone/lumia640-xl-dual-sim/specifications/ it says that lumia 640 xl has quad wcdma network bands and supports the following wcdma bands

• WCDMA network: Band 1 (2100 MHz), Band 2 (1900 MHz), Band 5 (850 MHz), Band 8 (900 MHz)
• But Amazon India website says that

its has dual wcdma bands and only supports WCDMA, 1900/2100 MHz.

When you are saying "The listings would be correct" then you are referring to the listings on Microsoft link or Amazon link. Whose listings are correct? Amazon or Microsoft?

So, still it is not clear Whether the Microsoft Lumia 640 XL Dual SIM Mobile phone being sold in India has dual wcdma bands or quad wcdma bands

Can anyone please clarify?