Learn how to unbrick/flash this device using sp flash tool from here
Note
Follow the instructions on how to flash the device carefully from the link above
I will not take responsibility on whatever may happen to your device.
Make sure you are downloading the exact ROM of the device you want to flash because
flashing a wrong preloder, will make the device completely dead
(can't power on, can't charge and will not be detected by a computer)
Platform: Android 4.4.2 OS (KitKat)Dimensions: 118 x 63 x 12.9 mm
Display: 5.5-inch IPS Touch Display 720 x 1280 pixels, 267 ppiProcessor: 1.4GHz Octa-core Processor
MediaTek MT6592
Mali 450 GPU
Storage: 16GB ROM up to 32GB microSD card
Memory: 1GB or 2GB RAM
Rear Camera: 8 MP Camera with LED Flash, AutofocusFront Camera: 2 MP Secondary CameraDual SIMGSM/EDGE 900/1800MHzWCDMA 2100MHz
3.75G Internet (Up to 21 Mbps)
4000 mAh Li-ion Battery CapacityINFINIX HOT NOTE X551 16+1 STOCK ROM
XUI INTERFACEAndroid 5.1 LollipopX551-G808-A1-L-20160722DOWNLOAD
XUI INTERFACEAndroid 5.1 LollipopX551-G808-A1-L-20160325
Android 4.4.2
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INFINIX HOT NOTE X551 (16+2 & 32+2) STOCK ROM
XUI INTERFACE
Android 5.1 lollipop
X551-G808-BC-L-20160722
XUI INTERFACE
Android 5.1 lollipop
X551-G808-BC-L-20160325
DOWNLOADX551-G808-BC-L-20160115DOWNLOAD
Android 4.4 KitKat
X551-G808-BC-KK-28A-20150709
X551-G808-BC-28A-20150422
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INFINIX X551 (16+1) CWM BACKUP ROM
Learn how to unbrick/flash device with CWM from here CWM Recovery&Scatter file - DOWNLOADCWM Backup rom DOWNLOADPlease leave a comment after using any these fileReport if you cannot download this file
ADS HERE !!!