Who or What is Teclast.
Even Amazon do not have the correct links to the teclast "support".

My latest Teclast T50Plus is my 4th tablet from teclast.
All good until now.
This tablet will NOT use any SD card inserted.
Offers to format, displays done.,
Try to open the sd card "this sd is corrupted, please format, so like a fool I do,
Exactly same result with 3 sd cards, 2 of which are brand new [bought to use with this tablet].
ALL 3 sd cards work without issue on "Samsung Mobile", Windows laptop, and teclast P30S
Guess that points to the T50Plus .

As purchased via Amazon [uk], logged in and selected "Returns*Orders" to start the "support process".
DUH! Amazon point to the manufacturer with an invalid link!!

So it's time to email CEO Amazon UK.