2 layers

AcconeerExtended
BGA-50 New Arrivals ROHS
The A121 is an uncategorised made by Acconeer in a BGA-50 package with 50 pins. BGA-50 New Arrivals ROHS.
JLCPCB lists it (part C5375601). 1 open-source board in 1 repository on GitHub use it.
The library has no symbol for this part yet.
The library has no footprint for this part yet.

BGA-50, with 50 pins.
JLCPCB lists it as part C5375601, with 0 in stock; the sellers' links on this page open their listings.
1 board in 1 repository on GitHub; the most starred are listed on this page, with their KiCad files.