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If I am not mistaken, it may be very easy to do the downgrade.
1. Change the firmware filename from .exe to .zip
2. Look inside the zip file, extract the file PRSVersion.dat located in eBookUpdater\assets\updateAssets\PRSVersion.dat
3. Edit PRSVersion.dat and change the version number from 1.0.0.5.1130 to 1.0.0.8.1130
4. Replace PRSVersion.dat with the edited version
5. Rename the firmware filename from .zip back to .exe
6. Run the firmware file and update the firmware
If this works, you will have version downgraded the firmware.
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