My teclast F5 is also bricked updating the BIOS. I located the BIOS chip on the mother board.
I am about to buy a USB programmer from china for this kind of chip. it’s very cheap.
https://fr.aliexpress.com/item/32793476447.html?spm=a2g0o.cart.0.0.24e13c00tUczo6&mp=1
I will post more messages if it works
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