Again, I am stuck in the step where I install the TWRP! I am in fastboot mode and I succesfully connected my phone to windows and "fastboot devices" show my phone. However when i execute "fastboot boot twrp-3.4.0-0-laurel_sprout.img" windows says:
C:\Users\PC\Desktop\platform-tools>fastboot boot twrp-3.4.0-0-laurel_sprout.img
Sending 'boot.img' (39892 KB) OKAY [ 0.884s]
Booting FAILED (remote: 'unknown command')
fastboot: error: Command failed
Probably I need to execute some command before. Could you please tell me how do I install TWRP? All tutorials I found online are different, some tell me to first flash boot stock_boot, others say that I must change active slot to flash the stock_boot and then change again and flash TWRP... So confusion, and I think I already did it all but never manage to make it work, everytime my phone restarts, it goes into fastboot