Fast forward to today, and the landscape has changed. BlackBerry World (the app store) is dead. Online servers are offline. Certificate dates have expired. If you pull your old 9720 out of a drawer, you’ll likely be greeted by errors like:
Today, enthusiasts have "fixed" the 9720’s gaming library through clever workarounds that bypass the dead official servers: blackberry 9720 games fixed
BlackBerry games aren’t regular APKs (like Android). They are distributed as .COD and .JAD files. These files require digital signatures. Most certificates issued for BBOS 7 games expired 5–10 years ago. When you try to install an old .JAD file via a browser, the OS blocks it because the security certificate is invalid. Fast forward to today, and the landscape has changed
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