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[Flash File] Hotwav Cosmos V21 Firmware Download [Stock Rom] [SP7731]

Hotwav Cosmos V21 Firmware

[Flash File] Hotwav Cosmos V21 Firmware Download [Stock Rom] [SP7731]

Hotwav Cosmos V21 Firmware Download.

This is a stock rom for Hotwav Cosmos V21.

You can download all Hotwav Cosmos V21 Flash File from Blogthetech

Hotwav Cosmos V21 Firmware Information

Rom NameHotwav Cosmos V21 Stock Firmware Rom
Based OnHotwav Stock OS
Rom OS VersionAndroid 6.0 Marshmallow
Rom TypeOdexed
SocsSpreadtrum
Software neededSpreatrum Upgrade Tool
CompressZip format
DriversSpreadtrum USB Drivers

How to Flash Hotwav Cosmos V21 Firmware


Hotwav Cosmos V21 is a SP7731 Spreadtrum phone which means you will need a Spreadtrum Upgrade Tool to flash Hotwav Cosmos V21 stock rom.

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Why we need Hotwav Cosmos V21 Firmware


It’s always advisable to backup Hotwav Cosmos V21 Firmware after purchasing it. You are definitely going to need it someday. You are going to need it for the following reasons.


  • Downgrade or Upgrade Hotwav Cosmos V21.


You can use Hotwav Cosmos V21 Stock rom to downgrade your smartphone or upgrade your smartphone. It depends on the release of the firmware or your choice if the option is available.


  • Unbrick Hotwav Cosmos V21.


Hotwav Cosmos V21 Stock Rom can also be used to unbrick any Hotwav Cosmos V21.  Smartphones can be bricked in the process of rooting or flashing a custom firmware or rom or recovery.


  • Unroot Hotwav Cosmos V21.


You can also use Hotwav Cosmos V21 stock firmware to completely unroot any Hotwav Cosmos V21 smartphone. You also can regain your warranty by properly flashing the official Hotwav Cosmos V21 stock firmware. It can be done by reverting back to the official stock firmware of Hotwav Cosmos V21 if your smartphone has tampered.


  • Fix Issues on Hotwav Cosmos V21.


Your Hotwav Cosmos V21 might develop issue which might be unknown to it you, if it a software related issue, you can restore and fix it by flashing the stock firmware for Hotwav Cosmos V21. Today, we are presenting all the Official Firmware, both Official releases and updates following it. You can download all of Hotwav Cosmos V21 Firmware here. If you experience any problem with any of the files, don’t hesitate to tell us.

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Requirements to flash Hotwav Cosmos V21 Firmware


  • Spreadtrum Device Drivers.
  • A working detectable USB Cord.
  • A Spreadtrum Upgrade Tool.
  • Hotwav Cosmos V21 firmware file.
  • A Windows PC.
  • A good battery backup.

Note that flashing a Hotwav Cosmos V21 firmware to your phone erases everything in your phone including contents in internal storage. It is always very advisable to backup your contents to an external storage or a PC. If your phone is bricked and can’t be accessed, I guess there is nothing you can do.

Follow this procedure below if you wish to flash Hotwav Cosmos V21 Stock Rom.

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Flash Hotwav Cosmos V21 Firmware using Spreadtrum Upgrade Tool.


  • Download Spreadtrum Upgrade Tool to your PC.
  • Download Hotwav Cosmos V21 Firmware.
  • Extract the Flash tool to your desired folder.Extract-Spreadtrum-Upgrade-Tool
  • Look for ResearchDownload and launch it.
    Launch Spreadtrum Upgrade Tool

    Launch Spreadtrum Upgrade Tool

  • Minimise Spreadtrum Upgrade Tool window.
  • Locate the downloaded Hotwav Cosmos V21 stock rom.
  • Extract the file from ZIP or Rar format.
  • Open Spreadtrum  Upgrade Tool.
  • Click on Load Packet.
    Load packet on ResearchDownload Tool

    Click on Load Packet

  • Locate the PAC file on the extracted Hotwav Cosmos V21 stock rom folder.
    Select-the-extracted-Firmware-Pac-file-to-flash

    Select the PAC File you want to Flash

  • Select the file in the directory.
  • Wait for it to load the files.
  • Power OFF your Hotwav Cosmos V21.
  • Connect your Hotwav Cosmos V21 while OFF.
  • Click on Start Downloading.
    Click on Start Downloading on Spreadtrum Upgrade Tool

    Click on Start Downloading on Spreadtrum Upgrade Tool

  • You will see a green bar when it finishes flashing
    Finished Flashing on Spreadtrum Upgrade Tool

    Green Bar on Spreadtrum Upgrade Tool

  • Done.
  • Your phone might reboot in the process.

If you face any difficulty flashing Hotwav Cosmos V21, please check whether you followed all the instructions and installed all the drivers properly..

If you don’t install all the necessary drivers, you may experience issues detecting your phone with the PC.

Install Spreadtrum Device Driver Download Spreadtrum Upgrade Tool Download Firmware

The Mastermind behind Blog The Tech, Love the future Tech and a big fan of Android Mobile Development. In his early 20s and an undergraduate of Electrical Electronics Engineering.

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