[General Questions and Answers] polesch999:
I have tried to flash the tablet with the firmware from 4 files with the HOME CSC file so that the data would not be reset. I downloaded this firmware from the Sammobile website.

I downloaded zip-file with the lastest official firmware on Sammobile.

It has 5 files in archive. I use all files except CSC. Instead of CSC I using CSC HOME files because I want to save the data on the tablet.

Unfortunately flashing ROM was unsuccessful.

I tried to change USB cable, to change USB port, different version of Odin but nothing helped.

Please look at screenshots.

It seems like a connection problem, as I understand it.

I tried to redownload the firmware in Odin.

I checked name of file firmware: T835PUU5CVE2_T835SER5CVE2. Model of my tablet SM-T835 (it written on a sticker on my tablet.

I tried to flash firmware again.

This is a code from Odin:

<OSM> Enter CS for MD5..
<OSM> Check MD5.. Do not unplug the cable..
<OSM> Please wait..
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS..
<OSM> Enter CS for MD5..
<OSM> Check MD5.. Do not unplug the cable..
<OSM> Please wait..
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS..
<OSM> Enter CS for MD5..
<OSM> Check MD5.. Do not unplug the cable..
<OSM> Please wait..
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS..
<OSM> Enter CS for MD5..
<OSM> Check MD5.. Do not unplug the cable..
<OSM> Please wait..
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS..
<ID:0/007> Added!!
<ID:0/007> Odin engine v(ID:3.1401)..
<ID:0/007> File analysis..
<ID:0/007> skip file list for home binary
<ID:0/007> apdp.mbn
<ID:0/007> msadp.mbn
<ID:0/007> persist.img.ext4
<ID:0/007> userdata.img.ext4
<ID:0/007> Home Binary Download
<ID:0/007> Total Binary size: 4724 M
<ID:0/007> SetupConnection..
<OSM> All threads completed. (succeed 0 / failed 1)

After it I tried to use different version of Odin - Odin 3.12 (PrinceComsy).

The result is the same unfortunately.

Tried to update the drivers and change the cable and switch to different USB ports.

Here is the code:

<OSM> Enter CS for MD5..
<OSM> Check MD5.. Do not unplug the cable..
<OSM> Please wait..
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS..
<OSM> Enter CS for MD5..
<OSM> Check MD5.. Do not unplug the cable..
<OSM> Please wait..
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS..
<OSM> Enter CS for MD5..
<OSM> Check MD5.. Do not unplug the cable..
<OSM> Please wait..
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS..
<OSM> Enter CS for MD5..
<OSM> Check MD5.. Do not unplug the cable..
<OSM> Please wait..
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS..
<ID:0/010> Added!!
<ID:0/010> Odin engine v(ID:3.1203)..
<ID:0/010> File analysis..
<ID:0/010> skip file list for home binary
<ID:0/010> abl.elf.lz4
<ID:0/010> bksecapp.mbn.lz4
<ID:0/010> xbl.elf.lz4
<ID:0/010> tz.mbn.lz4
<ID:0/010> hyp.mbn.lz4
<ID:0/010> devcfg.mbn.lz4
<ID:0/010> pmic.elf.lz4
<ID:0/010> rpm.mbn.lz4
<ID:0/010>cmnlib.mbn.lz4
<ID:0/010>cmnlib64.mbn.lz4
<ID:0/010> keymaster.mbn.lz4
<ID:0/010>apdp.mbn.lz4
<ID:0/010> msadp.mbn.lz4
<ID:0/010> sec.dat.lz4
<ID:0/010> NON-HLOS.bin.lz4
<ID:0/010> storsec.mbn.lz4
<ID:0/010> boot.img.lz4
<ID:0/010> recovery.img.lz4
<ID:0/010> vendor.img.ext4.lz4
<ID:0/010> system.img.ext4.lz4
<ID:0/010> persist.img.ext4.lz4
<ID:0/010> userdata.img.ext4.lz4
<ID:0/010> modem.bin.lz4
<ID:0/010> adspso.bin.lz4
<ID:0/010> cache.img.ext4.lz4
<ID:0/010> hidden.img.ext4.lz4
<ID:0/010> odm.img.ext4.lz4
<ID:0/010> Home Binary Download
<ID:0/010> SetupConnection..
<OSM> All threads completed. (succeed 0 / failed 1)
<ID:0/010> Removed!!
<ID:0/010> Added!!
<ID:0/010> Removed!!
<ID:0/008> Added!!
<ID:0/008> Odin engine v(ID:3.1203)..
<ID:0/008> File analysis..
<ID:0/008> skip file list for home binary
<ID:0/008> abl.elf.lz4
<ID:0/008> bksecapp.mbn.lz4
<ID:0/008> xbl.elf.lz4
<ID:0/008> tz.mbn.lz4
<ID:0/008> hyp.mbn.lz4
<ID:0/008> devcfg.mbn.lz4
<ID:0/008> pmic.elf.lz4
<ID:0/008> rpm.mbn.lz4
<ID:0/008> cmnlib.mbn.lz4
<ID:0/008> cmnlib64.mbn.lz4
<ID:0/008> keymaster.mbn.lz4
<ID:0/008>apdp.mbn.lz4
<ID:0/008> msadp.mbn.lz4
<ID:0/008> sec.dat.lz4
<ID:0/008> NON-HLOS.bin.lz4
<ID:0/008> storsec.mbn.lz4
<ID:0/008> boot.img.lz4
<ID:0/008> recovery.img.lz4
<ID:0/008> vendor.img.ext4.lz4
<ID:0/008> system.img.ext4.lz4
<ID:0/008> persist.img.ext4.lz4
<ID:0/008> userdata.img.ext4.lz4
<ID:0/008> modem.bin.lz4
<ID:0/008> adspso.bin.lz4
<ID:0/008> cache.img.ext4.lz4
<ID:0/008> hidden.img.ext4.lz4
<ID:0/008> odm.img.ext4.lz4
<ID:0/008> Home Binary Download
<ID:0/008> SetupConnection..
<OSM> All threads completed. (succeed 0 / failed 1)

Maybe my PC make this problems?