Bios updates are not to be done shorting Service Mode (ME_Disable), your fault…
Put back all jumpers to default position and try to update again…can’t fix it usually…if there’s any corruption in FW partition.
2 Solutions…IC SPI program of a full image or this guide and FPT write (this method uses current bios region and preserve Dell system data).
A full dump with FPT or/both CH341 should always be done before any other operation.