Micromax Bolt A66 [44 V20 20140212 USR] Stock Firmware, PAC File Download

This Micromax Bolt A66 Firmware, PAC file can be used with any service tools capable of Flashing PAC file on SpreadTRUM Android Devices.

Stock firmware are mostly needed to either upgrade your Micromax Bolt A66 or flash the phone to correct certain software issues or malfunctions on the phone. Here on this page I have contained the download link for the complete Micromax Bolt A66 Stock ROM, PAC file which can be used to flash factory OS back to your Micromax Bolt A66.

How to Download Latest Firmware and Flash Micromax Bolt A66 with this PAC File

1. Download SPD Download Tool from here and install it on your PC.

2. Download your Micromax Bolt A66, latest firmware pac File from here.

3. Open the SpreadTRUM Flash Tool you downloaded from the link above. It is compressed in a zip file, simply extract it onto a folder on your PC, open the folder to locate the SpreadTRUM Upgrade Tool application and then; double-click it to lunch the program.

4. Now, Put off your Micromax Bolt A66 or remove battery from it and re-insert the battery then, connect your Micromax Bolt A66 Mobile Phone to the PC.

5. Now, select the specific STOCK FIRMWARE you downloaded for your Micromax Bolt A66 android device by clicking on the Select Pack icon.

6: As soon as the file is loaded successfully, click on "Download Button" to commence the flashing operation.
NOTE: During the flashing operation, your phone may reboot once or twice. Just leave it and do not interrupt the operation.

7: Once the flashing operation is successfully completed, you will see "Previous Passed" message displayed in green on the SpreadTRUM Flash Tool.
CONGRATULATIONS! You have now successfully flashed your Micromax Bolt A66 android device.

For Graphical Illustration on how to flash Micromax SpreadTRUM android devices, see here: How to Flash Micromax Android Device: Step by Step with Pictures

Also Read: