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Recovery of entire disk from backup file on SSD fails. Works OK ir backup file is on USB stick. archive

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I see that your system (Gigabyte B360M DS3H) has bios F15 as the most current - are you running the latest?

I am running F14. Updating BIOS is a scary process. I am pretty sure you can brick your MOBO if it fails.  

Yes, it is a possibility - a very small one with current motherboards though since they have failsafes and often have dual bios firmware as well.  Updating firmware fixes bios bugs and security flaws too.  The current F15, is a patch for a CPU vulnerability that exposes your data to remote attack through the bios.  That's also pretty scary:

https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00233.html

Bios updates are generally safe if you take your time (don't rush if it appears stalled - let it do it's thing) and don't lose power during the firmware update.  I believe your motherboard has a backup bios too, just in case, as it is listed in the product overview:

GIGABYTE UEFI DualBIOS™

If one bios fails to load, it should automatically fail over to the secondary bios.

Bobbo_3C0X1 wrote:

Bios updates are generally safe if you take your time (don't rush if it appears stalled - let it do it's thing) and don't lose power during the firmware update.  I believe your motherboard has a backup bios too, just in case, as it is listed in the product overview:

GIGABYTE UEFI DualBIOS™

If one bios fails to load, it should automatically fail over to the secondary bios.

What sometimes is not automatically supported is the ability to downgrade if the upgrade succeeds in a readable BIOS, but the BIOS isn't.  I don't know about Gigabyte, but ASUS views any down-level BIOS as invalid.  It's a good idea to have a recovery plan in place before updating the BIOS.  

Yeah, make sure to get a supported bios - directly for the make/model from the manufacturer.  However, Gigabyte bios upgrades are pretty easy.  They also allow for a bios backup to revert too and typically have supported downgrades as long as the versions are relatively close to each other.