Aporte: Desempaquetar y empaquetar super.img y system.img.

[idroji]

Ya me funcionó!! Tengo que incluir system_b, product_b y vendor_b de esta manera:

lpmake \
 --metadata-size 65536 \
 --super-name super \
 --metadata-slots 1 \
 --device super:3221225472 \
 --group main:1553309696 \
 --partition system_a:readonly:886079488:main --image system_a=./system_a.img  \
 --partition system_b:readonly:0:main --image system_b=./system_b.img \
 --partition product_a:readonly:557142016:main --image product_a=./product_a.img  \
 --partition product_b:readonly:0:main --image product_b=./product_b.img \
 --partition vendor_a:readonly:110088192:main --image vendor_a=./vendor_a.img \
 --partition vendor_b:readonly:0:main --image vendor_b=./vendor_b.img \
 --sparse \
 --output ./super.new.img