Not absolutely certain but I always thought that BIOS updates are one way only. Once successful, there is no going back. If this is indeed the case, I think you have more than a small problem.
Huawei P10 review
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New iPad, iPhone SE & Red iPhone 7 on sale now
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.