Most of the times I restored factory settings on my X1C (no AMS), it was loaded with filament.
I have no other suggestions except to say it is probably time to submit a support ticket.
I sent my logs to Bambu and this is what I got.
“Looks like there are faults in the communication of the sensor for the filament and the tool head.”
They said they would send the parts with the order number but I bought it from Micro Center.
Bambu owns the warranty obligations, not Microcenter.
I am running a different issue that got me here. For me i was doing a normal firmware update which failed (retried offline, downgrade and all all same 0X0000000206 erro and after that everything is just acting weird. i was hoping a factory reset will reset everything but here lies the issue. it wont let me do a factory rest without unloading filament. my toolhead is unresponsive so i cant unload filament. and because i cant unlead filament my toolhead is still stuck on bad firmware. if anyone knows a bypass of doing a factory reset on the machine without the filament check that would be gold.