Is there any other way to roll back to Windows phone 8.1 except using the Windows/Lumia recovery tool?

[Windows Central Question]

is there any other way to roll back to windows phone 8.1 except using windows/lumia recovery tool?

when ever I've tried to install recovery tool its shows the error code 0x80091007-hash value isnt correct.. so i want a another way to roll back to win 8.1 .. plzz sir help me