My thinkpad T440p will be coming in soon and I been considering Coreboot/Libreboot but it requirwes a usb bios programmer, there are many of these from many different sellers on Amazon, but all of them are made in China by unknown companies, can these have any malware of them ?

I have a Lenovo Ideapad Flex 5i running a 10th gen Intel i5, I tried using TLP to set the battery charging limit to 80 but it always went over 80, but I did this using the TLPUI, where it mentioned that it was for Thinkpads, but I assumed that it should work in general. Is there any way to limit battery charging at all ?