How To Upgrade Infinix X551 (Hot Note) To Android 5.1 Lollipop Version

STEPS >>

• Download SP Flash tool from here
• Download INFINIX X551 latest Stock ROM from here
• Launch SP Flash tool
• Click on Download
• Select Scatter-loading
• Select the scatter file of that Stock ROM you have downloaded
• Click Open
• Unselect all and Select only Recovery
• Click on Format
• Connect device >> Power off device >> Holding Volume + and Volume - button >> Plug USB Cable
• Once device is successfully connected, 
• Patiently wait while format to proceeds
• Once device has been successfully formatted,
• Select Download
• Unselect all and Select only Recovery
• Click Download
• Connect device >> Holding Volume + and Volume - button >> Plug USB Cable
• Once device is successfully connected,
• Patiently wait while download proceeds (Download for Recovery)
• Once download has been successfully completed
• Select all and Unselect Recovery this time
• Click Download
• Connect device >> Holding Volume + and Volume - button >> Plug USB Cable 
• Once device is successfully connected,
• Patiently wait while download completes
• Once download has  successfully completed disconnect device & Perform a hard reset
• Hard reset completes, =>> Power on device

=>> Repair IMEI using Miracle Box >> learn how to do that from here 

=>> Repair IMEI using MTK ENGINEERING MODE APP >> learn how to do that from here

• You have successfully upgraded you device to a Lollipop Android Version like a PRO!

Follow the Screenshots or read the tutorials above

WARNING!
Flashing will erase all of your data
All described operations you are doing at your own risk.