Unable to Rollback from W10 to W8.1. Lumia 640 LTE AT&T

Unable to rollback W10 to W8.1, used WDRT, it restarts the phone several times then boots normally.
Screenshots attached.

Screen1_WDRT.jpg

Screen2_WDRT.jpg

Any idea to resolve this issue ?

Attached Images

• Screen1_WDRT.jpg (29.5 KB)
• Screen2_WDRT.jpg (26.2 KB)

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