How to switch slots without a computer or using TWRP?

website twrp slot a slot b I'm working with Android 9 Pie and I have one slot rooted and the other is not My reasoning to have my phone this way is dead canary slot free play I'm working with Android 9 Pie and I have one slot rooted and the other is not My reasoning to have my phone this way is

twrp slot a slot b Hello, If you are sure only the slot b is modified, then flash on slot b This way, both will be stock afterward   Boot TWRP in slot a; Install LineageOS , TWRP will install it to slot b! Flash to slot b  My device is indeed in a temporary TWRP flash

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