What is Reddit's opinion of Root Checker?

From 3.5 billion Reddit comments

I dunno any generic way but I think this should help: https://play.google.com/store/apps/details?id=burrows.apps.rootchecker

As for costumes - I have no idea but it would be logical to have something like that once Lena event is over

That should not be a problem, they are close enough but you just need to ensure you get the correct image. Also assuming you have your tab in dev mode and drivers to connect to your PC.

I used these instructions :

https://www.simplehelp.net/2015/08/25/how-to-root-the-samsung-galaxy-tab-a/

I got the t350 image from here:

https://autoroot.chainfire.eu/

I don't see your 380 but you can get that one here:

https://desktop.firmware.mobi/

I used odin but there's other apps, just the one in the post and the one i had familiarity with:

https://forum.xda-developers.com/showthread.php?t=2711451

I used this to check for root after the fact:

https://play.google.com/store/apps/details?id=burrows.apps.rootchecker

And not using titanium to remove bloatware:

https://play.google.com/store/apps/details?id=com.keramidas.TitaniumBackup

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Good luck my friend!