phantom 4 firmware main controller hard reset

Hello, this is an S.O.S. to all DJI reverse engineers... I have Phantom 4 with 2.00.0106 firmware, remote firmware 1.9.3, DJI GO 4.2.6 (Android), DJI Assistant 1.2.0 (Win). I have never applied hardware or software mods. 15 days ago I only try tu update to firmware 2.00.0700 with DJI Assistant...