Problem:
You need to know the correct release of your Raspberry Pi but it's not possible to identify it in the board, neither the storage box neither the product technical documentation.
Solution:
Run the next command:
cat /proc/cpuinfo
Check the information in the source link to identify the release of your model using the map table in the official Raspberry Pi website
Source:
https://www.raspberrypi.org/documentation/hardware/raspberrypi/revision-codes/README.md