Galaxy Note 5 suddenly stopped booting up and in recovery mode has dm-verity and failed to mount errors?

Question

All of sudden when I was trying to use my note 5 (unroot), I noticed that it was powered off and I couldn't power it on with power button. Can you please tell me if there is a way I can recover data on my phone without losing them? I also have Google Authenticator which is connected to many accounts online, If I lose data I will lose everything! Here is what I tried so far:

First thing I did was a soft reset ( power button + volume down) and the mobile turned on but unfortunately it kept looping on the Samsung logo screen. Then, I tried to go to recovery mode (power button + home button + volume up) and from there I tried "reboot system now", "wiping cache partition (which I hope it doesn't remove any data?)" and "Run graphics test: which failed with error no command and then wiping cached data" all of them without success. One thing I noticed in the bottom section of recovery mode there are these errors:

ODIN MODE
DOWNLOAD SPEED: FAST
PRODUCT NAME: SM-N920C
CA_ TYPE: CA_2
CURRENT BINARY: Samsung Official
SYSTEM STATUS: Official
FRP LOCK: ON
Secure Download : Enabled
KNOX WARRANTY VOID: 0 (0x0000)
RP SWREV: B:5 K:0 S:1

Android Recovery
samsung/nobleltejv/noblelte
7.0/NRD90M/N920CXXS5CRH1
user/release-keys

No Support SINGLE-SKU
Supported API: 3
dm-verity error...
E: failed to mount /system (Invalid argument)

Answer 1

You could try to flash all partition images (except userdata.img) via heimdall command line

heimdall flash --BOOTLOADER sboot.bin --CM cm.bin --PARAM param.bin --BOOT boot.img --RECOVERY recovery.img --RADIO modem.bin --SYSTEM system.img --CACHE cache.img --HIDDEN hidden.img

---

The above example command is created from partition list. This is how you get pit file

• install heimdall, python and samloader

• download and decrypt stock ROM for your region code

  C:\Android\samloader>samloader -m SM-N920C -r AFR checkupdate
  N920CXXS5CRH1/N920COJV4CRB3/N920CXXU5CRH1/N920CXXS5CRH1
  
  C:\Android\samloader>samloader -m SM-N920C -r AFR download -v N920CXXS5CRH1/N920COJV4CRB3/N920CXXU5CRH1/N920CXXS5CRH1 -O .
  downloading SM-N920C_1_20180820163853_vvggswhd8u_fac.zip.enc4
  [################################] 38453/38453 - 00:06:20
  
  C:\Android\samloader>samloader -m SM-N920C -r AFR decrypt -v N920CXXS5CRH1/N920COJV4CRB3/N920CXXU5CRH1/N920CXXS5CRH1 -V 4 -i SM-N920C_1_20180820163853_vvggswhd8u_fac.zip.enc4 -o SM-N920C_1_20180820163853_vvggswhd8u_fac.zip
  [################################] 615247/615247 - 00:01:21
  

• unpack files from zip

  C:\Android\samloader>7z l SM-N920C_1_20180820163853_vvggswhd8u_fac.zip
  
  7-Zip 18.01 (x64) : Copyright (c) 1999-2018 Igor Pavlov : 2018-01-28
  
  Scanning the drive for archives:
  1 file, 2520047837 bytes (2404 MiB)
  
  Listing archive: SM-N920C_1_20180820163853_vvggswhd8u_fac.zip
  
  --
  Path = SM-N920C_1_20180820163853_vvggswhd8u_fac.zip
  Type = zip
  Physical Size = 2520047837
  64-bit = +
  Characteristics = Zip64
  
     Date      Time    Attr         Size   Compressed  Name
  ------------------- ----- ------------ ------------  ------------------------
  2018-08-20 16:39:50 .....      5058737      1491256  BL_N920CXXS5CRH1_CL11762721_QB19211222_REV00_user_low_ship.tar.md5
  2018-08-20 16:39:50 .....   4797583545   2248597336  AP_N920CXXS5CRH1_CL11762721_QB19211222_REV00_user_low_ship_meta.tar.md5
  2018-08-20 16:44:16 .....     38092989     38093065  CP_N920CXXU5CRH1_CP10334463_CL11762721_QB19211222_REV00_user_low_ship.tar.md5
  2018-08-20 16:44:18 .....    273756344    231865000  CSC_OJV_N920COJV4CRB3_CL11762721_QB16863364_REV00_user_low_ship.tar.md5
  ------------------- ----- ------------ ------------  ------------------------
  2018-08-20 16:44:18         5114491615   2520046657  4 files
  

• extract pit from CSC file

  CSC_OJV_N920COJV4CRB3_CL11762721_QB16863364_REV00_user_low_ship.tar.md5
  

• inspect NOBLELTE_EUR_OPEN_HIDDEN150M.pit pit file with PIT Magic or PIT Viewer