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1. The haptic feedback works, but there is no number display, which renders it useless The last update is listed as late October, so I suspect that screwed things up.

2. Dont buy it.Thank you... 👍🤝 This is the best financial calculator ever created, and the app makes a great job at emulating it, and knowing this is an official release, makes the whole experience perfect.

3. It worked great at first, both portrait and landscape and then the landscape stopped.

4. I did want to share a fix I discovered after a recent update made my display blank (just the top where numbers should appear).

5. That restored my display.I used to love this app... But now it has stopped working, and it no longer responds to user inputs.

6. In any event, it is useless now.The portrait view is NOT an hp 12C calculator! This is a rip-off since other apps i use are portrait mode and I use the calculator in the same orientation.

7. To paraphrase, if the app does not reply to input, turn the phone on its side into landscape mode.

8. It is now usless!! A comment by a previous rater said to turn the app to landscape screen and press the menu button.

9. There was no better financial calculator & there is no better emulator.The hp12c is amazing once you take a little time to understand how it functions, BUT i wouldnt buy it for my phone again.

10. After working fine for years, app stopped working.

11. I'm heading back to a 12C knockoff that knows how to provide users an intelligent portrait implementation of the 12C!The HP 12C app worked fine, until it didn't.

1. Fix HP 12c Financial Calculator Not Working/Crashes/Errors/Unresponsive & Black/White screen:

1. Restart HP 12c Financial Calculator: Restarting the app will resolve most errors.
2. Update the HP 12c Financial Calculator App. Here is how:
   1. On Android goto PlayStore » Search for "HP 12c Financial Calculator" » Open HP 12c Financial Calculator » click "Update".
   2. On iPhone, goto AppStore » Your profile » Available Updates » Check for HP 12c Financial Calculator » click "UPDATE".
3. Clear HP 12c Financial Calculator app cache: Clearing cached data will force your app to retrieve the latest data directly from HP 12c Financial Calculator servers.
   1. On Android, goto Settings » Apps » Select "HP 12c Financial Calculator" » click Storage » click "Clear Cache".
4. Check HP 12c Financial Calculator app permissions. If any of these permissions required to use your device's features are disenabled, HP 12c Financial Calculator might not work.
5. Uninstall and reinstall HP 12c Financial Calculator. If nothing else has worked, completely uninstall HP 12c Financial Calculator then reinstall.
6. Restart your device. Last, restarting your device can often clear most problems causing HP 12c Financial Calculator not working

2. Fix HP 12c Financial Calculator Server issues & Internet Connection

1. Check network connection: An unstable Internet will make HP 12c Financial Calculator be unable to connect to it's servers. Ensure your wi-fi is working then restart app.
2. Disable VPN: VPN can cause connection errors and lead to HP 12c Financial Calculator not working. Make sure all VPNs are off
3. Enable background data: When Background data is turned off, HP 12c Financial Calculator may not be able to connect to the Internet when running in the background.