Stay safe, and always verify your downloads.
The easiest way to manage beta cores is through the update_all.sh script. : jtbeta.zip
is a vital key file used to unlock and play beta-stage arcade cores developed by Jose Tejada (commonly known as Jotego ) for FPGA-based gaming platforms like MiSTer FPGA and the Analogue Pocket . This file acts as a subscription-based "key" that enables gameplay on cores that have not yet reached public release. Purpose and Functionality Stay safe, and always verify your downloads