Flash firmware on Samsung SPH-M840
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How to flash Samsung SPH-M840?
Why reinstall the firmware?
Errors begin to appear in the Android OS.
Some installed applications stop opening.
Many programs from the Play Market do not work.
The phone restarts or shuts down for no reason.
The phone slows down a lot during operation.
You are not satisfied with the functionality of the stock firmware.
Where can I find the firmware?
On the official website of the phone manufacturer.
On sites where third-party developers post custom operating systems.
What should be done before installing the firmware?
Create a backup copy of user data and transfer it to another medium.
Insert your SD card into your phone. It must have enough memory to fit the firmware.
Remember your smartphone model.
Fully charge your phone. If the battery runs out during boot, the device will no longer turn on.
Download archive with Firmware. Place it on the SD card.
Installing TWRP Recovery
Download the Official TWRP App from the Play Market. Download, install and launch the application..
At the first start, you need to give consent to future manipulations, as well as consent to granting the Superuser rights to the application. Check the checkboxes and press the 'OK' button.
On the next screen, select 'TWRP FLASH' and give the application root rights.
On the main screen of the application, the 'Select Device' drop-down list is available, in which you need to find and select the device model for installing the recovery.
After selecting a device, the program redirects the user to a web page to download the corresponding image file of the modified recovery environment. Download the suggested *.img file.
When the download is finished, you need to return to the main screen of the Official TWRP App and click on the 'Select a file to flash' button. Select the file downloaded in the previous step.
Press the 'FLASH TO RECOVERY' button and confirm that you are ready to start the procedure - press 'OK' in the question window.
The recording process is very fast, and upon completion, the message 'Flash Completed Succsessfuly!' appears. Click 'OK'. The TWRP installation procedure can be considered complete.
Transfer the necessary files to the SD memory card. Using a PC or laptop card reader, it will be much faster.
Insert a memory card into the device.
To reboot in recovery, it is convenient to use a special item in the Official TWRP App menu, accessible by pressing the button with three stripes in the upper left corner of the main screen of the application. We open the menu, select the 'Reboot' item, and then tap on the 'REBOOT RECOVERY' button. The phone will reboot into the recovery environment automatically.
Firmware via TWRP
Before flashing, you need to clear the 'Cache' and 'Data' sections, press 'WIPE' on the main screen. This will delete all user data from the device, but avoid a wide range of software errors and other problems.
Everything is ready to start flashing. Press the 'Install' button.
The file selection screen appears. At the very top is the 'Storage' button, select the location where the firmware file is located.
Select the storage to which the files were copied.
Find the file we need and click on it. A screen opens with a warning about possible negative consequences, as well as the item 'Zip signature verification'. This item should be checked by placing a cross in the check-box, which will avoid using damaged files when writing to the phone's memory sections.
The procedure for writing files to the device's memory will begin, accompanied by the appearance of inscriptions in the log field and the completion of the progress bar.
The completion of the installation procedure is indicated by the inscription 'Successful'.
Summary: Type: Mobile; Battery: Li-Ion 1750 mAh; CPU: 1.4GHz; Smart Phone OS: Android 4.1.2; Dimensions: 121 x 63 x 11 mm; Formfactor: Bar; Keyboard: Screen; Weight: 96 g; Color: Yes; Other: Capacitive Touchscreen; Pixel aspect ratio: 1.50; Resolution: 800x480; Display PPI: 233; Screen Size: 4; Type: TFT; Audio: AAC, AMR, iMelody, MID, MIDI, MP3, MPEG3, MPEG, MPG; Camera: 5MP; Other: Geotagging, Camcorder, Cartoon, Panorama, Smile Shot, Single Shot; Secondcamera: 1.3MP; Videocapture: Yes; Videoplayback: MPEG4, MP4, 3GPP; Connectors: 3.5mm Audio, MicroUSB 2.0; Network: 802.11b, 802.11g, 802.11n; Features: Skype, Google Play, Google Search, Google Maps, Gmail, Email, Youtube, Fac ...
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