Are there any Stargate episodes (SG-1, Atlantis, Universe) that hints/imply that Carter cannot modify the Earth gate to dial all of the Stargates in the Milky Way Galaxy, the same way as the gate at Dakara did in "Reckoning, Part II"?
Sam has a cable running from laptop to Dakara device in order to interface with it. Obviously the stargate on Dakara can also be controlled from the Dakara device.
From this transcript
JACOB: I'm not getting anything. (He steps aside and lets Sam have a go.)
CARTER (as she starts to type): This may not be possible, y'know.
JACOB: C'mon, Sam -- it can't be any harder than blowing up a sun.
(Sam looks irritated.)
CARTER: Y'know, you blow up one sun and suddenly everyone expects you to walk on water!
(At that moment, the interface between the laptop and the Ancient screen begins to work.)
Jacob pushes the console on the Dakara device, activates device and stargate:
(Jacob is concentrating on the laptop as the readout finally drops to 0.76 and the message "Margin achieved" appears on the screen.)
JACOB: Point 76!
CARTER: Do it!
(Jacob slams his fist down onto the button on the console that will activate the weapon. The temple begins to shake.)
Up above the temple, a tall statue-like structure peels open like the petals of a flower. Near the Replicator ship in the temple grounds, the Stargate kawhooshes.
Sam can use her computer interface to reprogram the gate at Dakara from the dakara wave device.
... BAAL: You want me to reprogramme the Stargate to dial every Gate in the galaxy simultaneously.
CARTER: I know you used the Gates' automatic update programme to disseminate a dialling programme virus to the entire Gate network.
BAAL: With a virus you initially planted in my Stargate.
CARTER: No-one's trying to deny that we're mortal enemies here. Can you do it or not?
BAAL: I cannot believe I'm even considering co-operating with a female of the Tau'ri ... (he looks at Jacob) and a Tok'Ra.
SELMAK: This was not my idea, believe me.
BAAL: I'll instruct my troops to land.
CARTER: No way. You send one Jaffa down here and the deal's off.
BAAL: I cannot do what you ask by means of a hologram transmission.
CARTER: Sure you can. Just tell me what to do.
Kindly comment if you find something wrong with the logic or if you can remember any Stargate episode (SG-1, Atlantis, Universe) that says or hints or implies that they dont have the knowledge (software) to reprogram.