[Samsung Galaxy Tab A series ROMs, Kernels, Recover] Matty1993:
Mate if I could make a video I would, I cant help you though I'm on 8.1 oreo so have to wait for new type TWRP for oreo support,

I'm a phone technician, you need to do this,

Go to your settings menu, go to "ABOUT DEVICE" in about device tap SOFTWARE INFO then TAP ON THE BUILD NUMBER TAB 7 TIMES UNTIL IT SAYS DEVELOPER OPTIONS ENABLED, go back to the very first settings screen and scroll to the very bottom again there will now be a tab labeled DEVELOPER OPTIONS enter this menu NOW TOGGLE ON OEM UNLOCK to unlock the bootloader to allow TWRP TO BE FLASHED THIS IS A NECCESITY.

1 download Odin 3.13.1.

2 download & install either winrar or 7-Zip.exe

3 now look at your firmware name on the file you downloaded of your stock firmware is it MUST be "S1" or "U1" if it has a 2 in it you have the wrong firmware U2 is oreo 8.1,

3. Download the TWRP from here for the tablet,

4. Open Odin 3.13.1, Now the BL tab is (bootloader) the AP tab is for the (system) (recovery)(sboot) CP is your (modem) and CSC is (apps),

As you are only flashing a recovery it goes in the AP tab, so put the file into the AP tab.

5 now click the options tab on the Odin screen, then UNCHECK auto reboot,

6 now press the start button and wait for it to say PASS in a GREEN box,

7. FOLLOW THESE TO THE EXACT DOT...

7.1 hold all of these buttons at the exact same time & keep holding them until the screen goes black.

HOME BUTTON

VOLUME DOWN BUTTON

POWER BUTTON

7.2 as soon as the screen is black you MUST VERY QUICKLY BEFORE THE DEVICE BOOTS HOLD ALL OF THESE AT THE SAME TIME and keep holding,

HOME BUTTON

VOLUME UP BUTTON

POWER BUTTON

7.3 All you are doing is changing from volume down to volume up what I do is not let go of the home button and just switch from power & volume down to power and volume UP this way your only pressing 2 buttons again instead of 3, now it should boot itself to TWRP,

8 if it doesn't boot to the TWRP, recovery then you have to flash back the stock firmware as you didnt do the buttons right or fast enough to enter the recovery before it boots,

9 go to your stock firmware file which will be in a .rar format, right click over it and you will now see either winrar or 7zip tab depending what you have installed,

9.1 now select the winrar or 7zip tab and find the option that says "EXTRACT TO <your filename>.

9.2 wait for it to extract, after it is complete you will have 4.md5 files inside of a folder with your firmware name on it, they will be as follows

BL_T380×××U1××××

AP T380×××U1××××

CSC T380××U1××××

HOME_CSC T380××××U1×××

9.3 open Odin 3.13.1, NOW associate the corresponding files to there assigned tab in Odin

EXEPT FOR CSC you need to use the HOME_CSC as this will keep all your data and apps if you mess up,

If you use CSC you will wipe your tablet completely,

9.4 once all files are loaded into there corresponding BL, AP, CSC slots in Odin you can now connect the device in download mode & flash the stock firmware back to the device,

9.5 after flash wait for it to boot up again, and then start again.

Also talking to people like that will get you nowhere mate, if you dont have experience in this sort of thing or repairing it if you mess up then why are you trying to install it, the tutorial explained by ashyx is actually very very simple just take your time and go through each step bit by bit, take your time if you dont feel comfortable then please dont do it.

Thanks