I messed up android partition with TWRP

first of all sorry if I make any mistake, I’m new here.

Help. Today I decided to try to root my xiami mi a2 lite… I accidentally flashed twrp-3.2.3-0-daisy.img on both a and b partitions. Because of that, now I can only access the TWRP menu…

I think I should download the official rom and get its boot file, but im not sure and I dont want to mess it up more… I’ve downloaded the rom and found this .img http://prntscr.com/lmegw9 . If that’s it, is it enough to flash it? and in which partition? a or b?