Before updating, note your subscription group names, update settings, local listening ports, custom routing, and DNS settings. Subscription entries can usually be downloaded again, but manually added configurations, app-based routing, and custom rules may not be recoverable from a subscription. Store backups somewhere you control. Don’t publicly share URLs with credentials, configuration QR codes, or unredacted logs.
Before upgrading, fully quit the old client, including any tray or background processes. After installation, check that your configuration list is still there, then restore network features one at a time. Don’t change the client, core, subscription, and routing rules all at once; changing one thing at a time makes it easier to pinpoint the cause of connection issues. If the installer says your system isn’t supported, check the requirements instead of repeatedly downloading the package.
v2rayN, v2rayNG, and v2flyNG are graphical clients in the Project V open-source ecosystem. The client handles configuration, subscriptions, and system integration; the core handles connections and routing. A client launching successfully doesn’t mean the server settings match, and a subscription updating doesn’t mean every entry will work. Check each layer separately: import results, the selected configuration, and access from the apps you use.