OpenDeviceDB

Devices / phone

Microsoft Lumia 640 LTE Dual Sim

Also known as microsoft-dempsey

Open firmwareImported

A free replacement firmware exists.

Get started

One known way to put open firmware or software on this device, easiest first. Each one links to the project's own instructions.

Before you start
  • Back up your data and settings (and the stock firmware, when the guide says how).
  • Check the exact model, hardware revision and firmware version against the guide: a close model may not work.
  • Charge the battery or use a stable power supply; do not unplug during the install.

Install Nura/postmarketOS over USB (bootloader unlock)

Medium

Needs a cable or the command line · Nura/postmarketOS

You need
Computer with pmbootstrap and fastboot, USB cable
Device opened
No

Uses the bootloader's fastboot mode. The bootloader must be unlocked first, which wipes the device. Installing replaces the stock system: back up your data first. This is a testing port: what works varies, check the device page.

No install report yet. · Report how it went

Follow the official guide

OpenDeviceDB links to each project's own instructions and tools; nothing is flashed from this site. Flashing is at your own risk and may void the warranty.

ID
microsoft/lumia-640-lte-dual-sim
Category
phone
Vendor support
Unknown
Updated
2026-10-17
Curate this record on GitHubJSONClaim this device

Being worked on

No live claim. If you start working on this device, claim it so nobody duplicates your work.

Interfaces

No interface documented yet.

Projects

ProjectKindOriginLicense
Nura/postmarketOS (testing, microsoft-dempsey)firmwarecommunityGPL-3.0

Verification

Not verified. A "verified on hardware" badge requires a replayable test (hardware-replay) run on a real device with a stated firmware version.

Provenance

AI assistance not stated.

Status and claims as of the build date (2026-10-18). Data licensed CC BY-SA 4.0; imported data keeps its upstream license.