How to do a/b OTA Update in ROC-RK3399-PC devices

Hi, Compiled the source code and created source ota.zip using the below commands,
Step 1: Compiled source code and out directory generated.
Step 2 : mkdir dist_output
Step 3 : make dist DIST_DIR=dist_output
Step 4 : ./build/tools/releasetools/ota_from_target_files dist_output/rk3399_roc_pc_plus-target_files-eng.naren.zip ota_update.zip

ota_update.zip file generated in the source code directory.

FYI :
I have unzipped the OTA.zip file but am unable to find “payload.bin”

May I know, What is the procedure to update/flash OTA.zip file into the target device.

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