A la espera de lo que te diga el vendedor parece que lo más aconsejable sería reinstalar la última rom usando el programa MIFlash.
¿Sabes si tu terminal es el que lleva procesador Qualcomm o mediatek?. Si es Qualcomm podrías usar lo comentado aquí:
enlace.
Hola 0jos0 y gracias, completo la info con las caracteristicas del movil, habra que pensar que es lo que me han mandado ;-), pq ya digo que no arranca...
General
Brand
Xiaomi
Model Redmi NOTE 4
Color Silver
System
Operating System MIUI 8 (Base on Android 6.0 OS)
CPU Helio X20 MTK6797 Deca core 2.1GHz
GPU Mali T880 MP4 700MHz
RAM 3GB
ROM 32GB
Extended Storage 128GB
Display
Screen type capacitive screen
Screen size 5.5 inch
Screen resolution FHD (1920×1080 pixels) screen display
Network
Wireless connectiveity GSM, 3G, 4G, GPS, WiFi, Bluetooth
Frequency 2G GSM:900/1800/1900MHz
3G WCDMA:850/900/1900/2100MHz, TD-SCDMA: B34/39; EVDO:BC0/BC1
4G FDD-LTE:850/900/1800/2100/2600MHz, TDD-LTE: 38/39/40/41MHz
Bluetooth Yes.4.2
WiFi Yes, 802.11a/b/g/n/ac
GPS Yes, GPS, AGPS, GLONASS, Beidou
Camera
Camera type Dual cameras (one front one back)
Back camera 13.0MP
5 lens, f 2.0 aperture
Flash color temperature
Support PDAF phase focusing
Dark light quality enhancement technology
HDR high dynamic range adjustment technology
Panorama mode
Burst Mode
Facial recognition
Real-time camera filters
Front camera 5.0MP
36 second-generation intelligent beauty, real-time self-timer beauty f 2.0 large aperture
Real-time video call beauty
Self-timer countdown
Facial recognition
Video recording Yes
Connectivity
SIM card slot Dual SIM Card, Dual standby (1 Nano SIM Card and 1 Micro SIM Card,or 1 Mirco and 1 microSD Card)
TF card slot Yes
USB slot Micro USB
Audio output Yes (Charging mouth interoperability)
Microphone Supported
Speaker Supported
Media
Video format 3GP, MP4, RMVB
Audio format WAV, AMR, MP3
Image format GIF, JPEG, BMP, PNG
FM radio N/A
Language&Feature
Language
Bahasa Indonesia, Bahasa Melayu, Deutsch, English(India), English(United Kingdom), English(United States), Espanol(Spanish), Espanol(America), French, Italiano, Magyar, Uzbekistan, Polish, Portuguese(Brasil), Romana, Slovencina, Vietnamese,Turkish, Czech, Russian,Ukrainian,Bulgarian,Greek, Hindi, Bengali, Gujarati, Assamese, Tamil, Telugu, Nepali, Thai, Arabic, Persian, Hebrew, Korean, Traditional/Simplified Chinese
Sensor Fingerprint recognition
Infrared remote control
Gravity sensor
Three-axis gyroscope
Electronic compass
Light sensor
Proximity sensor
Hall Sensor
Additional features 4G, WIFI, GPS, Bluetooth,Gesture Sensing,Smart Wake, Ebook, Email,Messaging, wallpapers, calendar, calculator,clock, camera,Google Play Store,
tethering & portable hotspot, smart wake, cast screen, Touch ID, IR remote control, etc
Battery
Battery type Lithium
Capacity 4100mAh Built-in
Standby time About 2~3 days
Charger USB, travel charger
Dimension & Weight (Main Product)
Dimension 151mm*76mm*8.35mm
Weight 175g
Package Contents
1 × Phone
1 × Built-in Battery
1 × Eject pin
1 × USB cable
1 × 5V/2A Power adapter (A right AC Adapter will be sent as your shipping country)