Troubleshoot COME one stage at a time.
Download, install, launch and login are different systems. Find the first one that failed.
Download did not finish
Check storage, reconnect to a stable network and resume or restart the download from the current Download page. Delete partial duplicates so you do not open the wrong file.
Keep the source, action and evidence in the same chain.
Android did not install
Read whether Android reports a source-permission block, package conflict, parse error or device-policy restriction. Each message points to a different fix; turning off every security control is not a diagnosis.
Open the installation guideRead the device message before changing a setting.
COME opens to a blank screen
Update Chrome and Android System WebView, check automatic time, restart the phone and compare Wi-Fi with mobile data. If other web content works and the issue persists, record the time and screen for support.
Keep the source, action and evidence in the same chain.
Login is the only failing stage
Keep the installed app in place and use the account checklist. Reinstalling does not correct a wrong password, delayed verification code or service-side account status.
Open account login helpRead the device message before changing a setting.
Common questions.
Short answers first. The linked guides carry the full context.
Should I clear all app data first?
No. Start with the stage that failed. Clearing data can remove local settings and will not fix every cause.
Why does Wi-Fi work but mobile data fail?
Network filtering, DNS, data-saving or carrier routing can differ. Record the comparison and restore any setting you temporarily changed.
What details help support?
Share the Android version, phone model, Chrome and WebView versions, exact error, time and reproduction steps—never passwords or OTPs.
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