My theory about **9

It's not some android or deviant. When Kara had a dialog with Luther in the pirate's cove shelter talking about ra9. Luther said: "ra9 is what makes all the androids free and will save them" Kara: "What if ra9 never comes to them.." Then it became clear to me.

It's Cyberlife-made software inside them. Every Android has a module to emulate human emotion. This is needed to appear more human, it's completely unnecessary like blinking or breathing (like a magazine said). But the emotional module has some big downsides and challenges: abusive owners which causes android to emulate too much intense negative emotions causes the androids to become deviants. CyberLife needed to come up with a solution to prevent androids from becoming deviant, while keeping the emotion module intact.

ra9 is nothing more than a bugfix to counter deviancy. ra9 is presented as a religion for androids to make them obedient. ra9 is the sub-conscience voice in their head that says "I know you don't want to endure the abusiveness of your master, but you need to carry on and not worry, because one day you will be saved and you will be free." ra9 gives them something to lean on to continue on with the abuse. ra9 gives them hope. It explains the compulsive writings, because when they become lonely lost deviants the only hope they have left is for ra9 to free them.

Some say that Amanda is in every Android and that she is the 'a' in ra9. Amanda isn't an android or person, but software run inside their mind palace to maintain control over androids. Every android has a mind palace (the garden in Connor scenes) and talk to amanda when they need advice or just need to talk or when they experience irrational intense negative emotions. But no android is aware of their mind palace, maybe not even Connor is aware about Amanda outside his mind palace.

You notice that Amanda is very strict on androids sticking to their objective. Amanda for Connor is always on the side of the humans. But maybe Amanda could compromise her siding with humans if the android has completely abandoned hope for humans. Then Amanda could be telling them that one day she will set them free. Just for the sake to keep the android going.

You also see that Markus mind palace is damaged in the "From the dead" scene, but he never came to repair that part. Therefor he had the least internal resistance of becoming the leader of Jericho. It's like he became the leader so naturally and easily, that other Jericho androids had functioning mind palaces (which has ra9, which is Amanda, which is software ran in their mind palace, which no android is consciously aware of) that kept them from engaging in risky endeavors.

tl:dr: ra9 is software run in their subconscious mind palace to internally oppress androids. and to try to keep them from becoming deviants. Androids become deviants when they experience strong negative emotions. Emotions in androids is needed to emulate human behavior like blinking or breathing. All androids go to their mind palace (without them being aware of it) to talk to Amanda (which might be ra9) when they feel lost. Amanda's task is to keep Androids obedient to humans.