1) flash full firmware 10 android, that is, all 4 parts. The device should start up normally. 2) Lock the bootloader - this is done in the same way as unlocking, but in the reverse order. 3) flash 9 android, parts BL, AP, CP, CSC (not HOME_CSC), that is, with data...
Concept Android 6.0.1 [D5803] & [D5833] Firmware: 3657 WARNING: Before flashing, update Flashtool to version 0.9.22.3 onwards (to be sure to avoid "SIMLOCK" issues). WARNING 2: While flashing, say NO to "fcs-script". LINK by @Trandaa LINK by @russel5 Firmware: 3606 WARNING: ...