in-place upgrade fails from b29574 to latest vnext b29595

Hi all, 

is anyone facing the same issue IPU fails on a fresh b29574 upgrading to latest using WU?

provided more information in feedback hub. Thanks for sharing your experience.

as a next attempt I will mount ISO and upgrade. mind b29574 was the base bare metal installation so no previous IPUs involved.
related feedback https://aka.ms/AA11g03n

Installed roles:
- Hyper-V

Specialities:
 

• tried SysWOW64 removal but failed to do so https://aka.ms/AA11eyy5
• OS Drive is ReFS, potientially related https://aka.ms/AA11eyy8

<?xml version="1.0" encoding="utf-16"?>
<SetupDiag xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="https://docs.microsoft.com/en-us/windows/deployment/upgrade/setupdiag">
  <Version>1.7.0.0</Version>
  <ProfileName>FindRollbackFailure</ProfileName>
  <ProfileGuid>3A43C9B5-05B3-4F7C-A955-88F991BB5A48</ProfileGuid>
  <FailureData>0xc1900101-0x20017 Error: SetupDiag reports rollback failure found.Last Phase = FinalizeLast Operation = Cleanup external drivers after installationError = 0xC1900101-0x20017</FailureData>
  <FailureData>LogEntry: </FailureData>
  <FailureData>Refer to "https://docs.microsoft.com/en-us/windows/desktop/Debug/system-error-codes" for error information.</FailureData>
  <FailureDetails>RollbackErrorCode = 0xC1900101, ExtendedCode = 0x20017, LastOperation = Cleanup external drivers after installation, LastPhase = Finalize</FailureDetails>
  <Setup360Result>0xc1900101</Setup360Result>
  <Setup360Extended>0x20017</Setup360Extended>
  <SetupPhaseInfo>
    <PhaseName>Finalize</PhaseName>
    <PhaseStartTime>06/06/2026 13:16:53</PhaseStartTime>
    <PhaseEndTime>06/06/2026 13:17:35</PhaseEndTime>
    <PhaseTimeDelta>0:00:00:42.0000000</PhaseTimeDelta>
    <CompletedSuccessfully>true</CompletedSuccessfully>
  </SetupPhaseInfo>
  <SetupOperationInfo>
    <OperationName>Cleanup external drivers after installation</OperationName>
    <OperationStartTime>06/06/2026 13:17:35</OperationStartTime>
    <OperationEndTime>06/06/2026 13:17:35</OperationEndTime>
    <OperationTimeDelta>0:00:00:00.0000000</OperationTimeDelta>
    <CompletedSuccessfully>true</CompletedSuccessfully>
  </SetupOperationInfo>
</SetupDiag>

 

 

also noticing uncommon links in root as if I were using FAT32.