Step 2: Reset your network settings by tapping "Settings" -> General -> Reset ->Reset Network Settings. Also, reboot all your hardwares, including your iOS device, modem, and router. This is to ensure you have better internet connection.
Step 3: Make sure that you have updated your Cydia, Also make sure that all packages are up to date, Launch "Cydia" -> "Changes" -> "Refresh" then update any available update.
Step 4: after all the above steps if the error still appears so it's better to uninstall the repo that containing the Cydia tweak then try to install it again.
Step 5: iF the error still appears so you should restore your iPhone and install a new Cydia
That's it. Please let us know which step solves your "Hash Sum Mismatch" Cydia error problem.
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To fix the mismatch error in Cydia try rebooting the jailbroken iPhone and restart the Cydia.