I have the same problem.
Recently I updated my PC from windows 8.1 to windows 10.After almost a month I returned back to windows 8.1 from windows 10.
When I tried to install dell backup and recovery (Backup-and-Recovery_Application_64M9D_WN32_1.8.1.71_A00) I got factory error 5.
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I cannot refresh my PC from windows also. I am getting the error “could not find the recovery environment”.
Now in command prompt
1. reagentc/info
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2. reagentc/enable
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3. Exit and reboot.
After the reboot I tried to install dell backup and recovery again. Then also I got the same “factory setup error 5”.
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Then I checked the reagent/info in command prompt after reboot. It shows it is disabled.
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Please help me.
Thank you