WBA 12/13 accepting some but not all bills

[CBRed]

Hello all,

I have an S+ with a WBA 12/13 BV. I’m trying to figure out what bills it accepts and what it won’t. So far, it takes some ones and none of the new bills. I found a couple old small head 100s and it will take one of those but not both. Just trying to see if this is an issue with the BV itself (needs to be cleaned, etc), and if it will accept the new bills or not. I see there are some updates that can be performed but I have little experience with slots at this point, so any help would be appreciated! Attaching a photo of the BV and MPU as well.

[CBRed]

To clarify, I’ve tried only the new bills that have colors on them as well. So ones, the old hundreds, then everything else I have tried are those. Haven’t tried the large headed no color bills.

[Sunrise Side]

Can you post a picture of the underside of the BV? Looking to see if you have flash memory type BV or EPROM. Try a new $10, $20, $50