The most recent 161-in-1 cart has 4 different flash ICs. I've now made about a dozen of these (not a big sample size) but I did notice a disturbing trend that some might want to be aware of. While the PROM, SROM and MROM flash chips are solid, not all the F0095H0's are made equally. I've had 3 of them fail on me during programming (from 3 different donor boards) Most common failure is hanging on writing to a specific sector on the same bank.
I'm not sure if this is caused due to these recycled flash chips being abused in their past life and they finally gave up during the reprogramming stage. Or maybe they've always been questionable and 161-in-1 makers shipped these with some sector flaws to customers thinking that the chances a buyer ever finds the bad sector during game play is nil.
Whatever the case is, when we reprogram these, we exercise every sector and now you uncover all their potential flaws. Also, FWIW, all 3 ICs came from AES carts.