Please, help I need to solve before tomorrow. Rom, ota and Google security

[The-Cronos]

Is very urgent I hope someone can help.
I have a xiaomi mi a3 phone that I need to root.
Can anyone redirect to the complete guide for global version?

I need the Ota updates not to be installed, I need the phone to not get any updates.
How can I block phone to not get any update.?

After rooting is it possible to make the Google play security disabled permanently?

What is the best rom?
Please hope someone can help me.
Thank to anyone that can dedicate me some time.

 

[Sami Devo]

U can disable it on dev. options.
untick auto system update install.

and there r pretty roms for a3
nevertheless non r so much perfect as stock.
u can use EVO X. latest as it has no stock camera u have to use ANX AND GCAM.
otherwise all things seems fine..
search in youtube or xda Evo thread for guidelines.

 

[The-Cronos]

U can disable it on dev. options.
untick auto system update install.

and there r pretty roms for a3
nevertheless non r so much perfect as stock.
u can use EVO X. latest as it has no stock camera u have to use ANX AND GCAM.
otherwise all things seems fine..
search in youtube or xda Evo thread for guidelines.

I did disabled the option n on developer and yet the update of Google security of August is showing up. I also tried to rename the update service inside the system /etc

Any other suggestion?
Any guide to mount twrp? Otherwise how can I flash a costum rom?
My phone is rooted with magisc. And I would want to hide it from app drower as well.

 

[Hugask]

I did disabled the option n on developer and yet the update of Google security of August is showing up. I also tried to rename the update service inside the system /etc

Any other suggestion?
Any guide to mount twrp? Otherwise how can I flash a costum rom?
My phone is rooted with magisc. And I would want to hide it from app drower as well.

If you want to experiment with roms use pixel experience, it's a stock like experience, very polished (more than stock, no random reboots or crashes. Here's the link to the offical pixel experience tutorial: https://wiki.pixelexperience.org/devices/laurel_sprout/install/)
Is that why ur trying to avoid the new patch? A buggy update?