[Samsung Galaxy Tab S3 ROMs, Kernels, Recoveries, &] matrixmainframe:
Followed the instructions exactly.

Hello All

I have a Galaxy Tab S3 SM-T820running the Stock Android 8.0 T820XXU2BRL1 (UK BTU version) from Sammobile which I flashed yesterday and which is working without problem.

I see from reading the thread that some people are having problems and although I am not an expert I thought that if I shared what I have found it may help

In short I followed the instructions given in this forum but in one or two places changed the wording to try make it a little clearer. Yes I did use the encryption disabler as instructed because, like I said I am not an expert and I trust the instructions and am not confident enough to question whether the encryption disabler is needed or not so I used it.

As a result my Tablet is working but I cannot comment on USB-OTG as I have never used it as it is ridiculously and painfully slow. So thank you so much to the guys who provide the instructions and flashing files and their instructions, which I followed exactly are as follows:

1. You require:

a)	ODIN

b)	Original firmware: SM-T920

c)	TWRP

d)	Magisk

e)	Ashxy's Oreo encryption disabler

2. PREPERATION

a)	In Settings Enable Developer options and enable OEM unlock. (Do not ever turn off Developer Options or OEM unlock as this will cause your device to refuse to boot and require a full factory restore.)

b)	Copy Magisk and Oreo encryption disabler onto microSD card (I did this before I did anything else)

c)	Switch tablet off, plug in USB cable between tablet and computer (I did this in the order stated otherwise any flash failed)

3. REFLASH ORIGINAL FIRMWARE (Optional if your tablet is already running Oreo)

a)	Enter Download mode (Home, Down Vol, and Power). Press Vol up to continue

b)	Open up ODIN, confirm that ODIN can see your tablet.

c)	Auto Reboot is selected. Then click Start.

d)	Allow reboot to the Welcome screen where you can select your language.

e)	Power off the tablet using the power button

4. FLASH TWRP

a)	Enter Download mode (Home, Down Vol, and Power). Press Vol up to continue

b)	Open up ODIN, click Options, deselect Auto Reboot. Click the Log tab so you can monitor progress

c)	Click AP button on Odin, select TWRP and START

5. ENTER TWRP AND CONFIGURE

a)	Go straight to TWRP without letting the Android System reboot.

(Volume Down, Home, Power) to get out of Download mode and immediately swap to (Volume Up, Home, Power) when the screen blanks.

b)	In a few secs, you will see the TWRP first screen, you can let go of all the buttons.

(If you don't see then TWRP boot splash try again from the start of 4. FLASH TWRP).

c)	Swipe to Allow Modifications.

d)	Click Wipe then Format Data, type yes and let it complete. Then click back until you get to the 8-button main screen of TWRP.

e)	Click the Mount button. Select Storage button, confirm that the Internal Storage shows non-zero MB. If it does, you know data partition is now mounted properly. Select Micro SD Card storage. Click Back until you are back at the 8-button main screen.

f)	Click Install button, install the Magisk zip file. Once finished, click Back to get back to the install screen (do not reboot yet).

g)	Install the Oreo encryption disabler zip file. When it completes, you can press the Reboot System button and let your tablet reboot into Android.

6. CONFIRM DATA ACCESS IN TWRP

a)	Before configuring your tablet, turn off the tablet and re-enter TWRP (Home, Vol up, Power).

b)	*Important* Since you will not be changing your system partition, this time, when you get to the "Keep System Read only?" screen, click the Keep Read Only button.

c)	In the 8-button screen of TWRP, click Mount, click Select Storage. Confirm that the Internal Storage is greater than zero MB. If it is, congratulations, you have TWRP installed with /data mounted.

d)	Reboot to System

7. FUTURE USE OF TWRP

a)	Unless you are planning to make changes to the System, continue to choose the Read Only System when you return to TWRP.