How to switch slots without a computer or using TWRP?

Inactive slot is flashed during an OTA update while the OS is running on active slot, without distribing user's workflow If flashing goes well

From what I read, I should first boot into TWRP then flash it, else I will break things, correct? If I manage to basically dual boot my

dragon link slot game slot? 04:41 - Como descobrir o slot ativo atualmente? 05:34

ttg slot if you're on partition slot A then the update will be installed to Slot B Unlock