How to app unlock your HTC S621 Windows Mobile Smartphone

This tutorial will guide you in “app unlocking” your HTC S621. I was hoping to create something like ‘how to app unlock a windows mobile smartphone’, but after spending hours and hours trying to unlock my phone, I’ve discovered there are possibly hundreds of different ways – no two are the same, and not all will work for all phones. I can only confirm that the following method works for Rogers (a Canadian mobile provider) customers using the HTC S621. It may work for other Smartphones as well.

App unlocking will allow you to install “unsigned” 3rd party software. If you’ve ever received the error “Installation was unsuccessful. The program or setting cannot be installed because it is not digitally signed with a trusted certificate”, this tutorial is for you.

installation was unsuccessful the program or setting cannot be installed because it is not digitally signed with a trusted certificate

Please note: This guide was originally published back in 2007. Quite obviously, a lot has changed since then. With that said, the software and steps outlined in this guide are still valid and work to this day.

You’ll need to download these 2 files – SP_AllowCertificateInstall.cab and regeditSTG2.exe.

  1. Upload SP_AllowCertificateInstall.cab to your device (or download it directly to your device). Save the file on your devices main memory, not on a mini-SD card. Use the file manager to navigate to SP_AllowCertificateInstall.cab and run it. Click Done when it’s done.
  2. app unlock your htc S621 smartphone

  3. Now upload regeditSTG2.exe to your HTC. Use the file manager to navigate to regeditSTG2.exe and run it.
  4. app unlock your htc S621 smartphone

  5. Now from inside the registry editor, navigate to HKEY_LOCAL_MACHINE\Security\Policies\Policies
  6. app unlock your htc S621 smartphone

  7. When you get to the second Policies folder, click the Values button.
  8. app unlock your htc S621 smartphone

  9. Highlight the 00001001 entry and then select it.
  10. app unlock your htc S621 smartphone

  11. Change the Value data: from 2 to 1, and then click Done.
  12. app unlock your htc S621 smartphone

  13. Now highlight the 00001005 entry and then select it.
  14. app unlock your htc S621 smartphone

  15. Change the Value data: from 16 to 40, and then click Done.
  16. app unlock your htc S621 smartphone

  17. Now scroll down to the 00001017 entry, highlight it and then select it.
  18. app unlock your htc S621 smartphone

  19. The Value data: may already be set to 144. If it is, leave it alone (just click Done). If it’s not, set it to 144 – then click Done.
  20. app unlock your htc S621 smartphone

  21. Now you can close down the registry editor and reboot your phone (turn the power off, then back on again). Your HTC S621 is now app unlocked and ready to install unsigned software.

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6 thoughts on “How to app unlock your HTC S621 Windows Mobile Smartphone”

  1. Chris (A different one)

    Ross – Thanks a bundle. I’d been pulling my hair out trying to figure out why I couldn’t change the registry values myself.

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