Yes you can, but remember you only have one data partition. You can read more about it on Google's A/B scheme explanation.
thanks for reply and remind,
I did read A/B slot explanation by some article, content arround I can hold 2 systems, so I try to flash custom rom on A/B scheme first time, as my last post,
my current stock rom is slotB, so I set_active A and boot to twrp and wipe it first, then install "EvolutionX_2.1_Z01R-9.0-20190916-2008-OFFICIAL.zip" and wipe dalvik cache after flash, sadly to say its fail......
boot loop, and auto jump to slotB still can't boot up to stock rom, but the bootloader version is update success to "WW-90.11.162.72".
I try to flash twrp to slotB too and flash evoX, still fail, 2 slot dead, 2 combo hit:angel:, current status is
I power on my 5z, unlocked bootloader warning screen > asus logo > reboot > unlocked bootloader warning screen > asus logo > reboot
do you have any idea for me too or does any one who can help too, thanks all