im very torn about the trope of robots "regaining their wiped memories" because what a joy it would be to learn everything about the people you love all over again, but also it is theoretically possible.
when data is deleted on something like a hard drive, the information doesn't actually leave the device. The computer essentially "shreds" it down into binary and puts it a forgotten corner. even partially destroyed hard drives can have data recovered from them. kind of like how casette tapes and dvds work when you overwrite data/audio. It's still there, in a way, albeit fractured and sometimes incomplete.
So on the one hand, yeah it makes sense that that could happen but at this point why do it? why not write a story about a robot with amnesia who for some reason doesnt have access to the necessary equipment to restore their memory because of the damage/situation/cost/etc and must come to relearn who their friends are, their history as well as their own, and their flaws?