Doogee X20 FRP Error

SigmaKey v.2.29.20 build 01
394850602 Sigma dongle 2.29, Initializing...OK
Pack 1: Activated
Pack 2: Activated
Pack 3: Activated
--------- 2019-02-20 11:40:44 ---------
SigmaKey 2.29.20b1 MTK: Remove FRP (Doogee X20)
Connecting...Error 000007D5:02EF

Tried several times and not done