as the topic says I'm desboquear error that the bootloader firmware.
had already unlocked in .290 and now I can not.
excuse my bad english
My work step..
Upgrade via PCsuit then use Flashtool create 14.2.A.1.136.tft (cant not unlock via Fastboot)
Downgrade to .290 (cant not unlock via Fastboot), But I use Flashtool64 Unlock my C6902 by downgrade to .290 (I'm not sure if unlock via flashtool on .136)
then flash 14.2.A.1.136.tft that I has created, then use fastboot flash DoomKernel v6, restart into phone, open SuperSU upgrade and install.
Turn-off and flash 14.2.A.1.136 Kernel (Only kernel).
Finally I got Officail firmware with rooted.
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