Hello.
We have problem with this mB NM-A311, Lenovo G50-30. It came after water damage. We repaired MB, there was no video, so we flashed BIOS, after flash we can turn it on with video, it´s working for about 10 times, then the bios goes off and laptop is again without video. When we read the chip it´s rewritten a part of BIOS got 00 instead of FF. We also tried to replace the chip with 2 others, we tried other binary files, we tried to reprogram the EC chip. Still the same. After flash laptop works a few times and then bios get corrupted. Do you have any clue where to look ?