failed windows 11 upgrade - how to recover?

[edwar64896]

upgrading windows 10 pro to windows 11.TPM 2.0 enabled.Installation ran all night and all next day, stuck on 99%shutdown machine.rebooted and it appears to have attempted a boot into Windows 11 but cycles through the restart process continually.How can I fix this? I am attempting to create windows 11 media on a USB and troubleshoot this way. Is there anything else I can do, the setup of that machine is critical and needs to remain if at all possible.

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