Hi,
To deal with those avhdx files, you can try manually merging them:
https://www.nakivo.com/hyper-v-backup/merge-hyper-v-snapshots-step-step-guide/
Please note: Information posted in the given link is hosted by a third party. Microsoft does not guarantee the accuracy and effectiveness of information.
And for the error message, I would suggest that you restart the VMMS service fisrt, if the problem still exists, try this:
https://www.makeuseof.com/fix-the-windows-access-denied-error-0x80070005/
Please note: Information posted in the given link is hosted by a third party. Microsoft does not guarantee the accuracy and effectiveness of information.
Thanks for your time.
Best regards,
Danny
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