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Today I upgraded my iPhone to IOS 9 but when I tried to play trymyapps to earn some money, I cannot do it now. Is it because of incompatibility? Can I downgrade it to my original IOS8?

Does your problem with trymyapps have anything to do with Editorial?

Just think there will be someone who can help.:(

Right after we've solved "whirled peas". :-)

Apple usually closes the signing window (a time frame in which it will allow a certain iOS version to be installed on iDevices) for the previous iOS version shortly after a new release, but keeps it open for a while (possibly in case something like this happens: that there are compatibilitiy problems). This means you can downgrade your device to iOS 8.4.1 for now.

To do so, you will need to download the iOS 8.4.1 .ipsw (look at ipsw.me) and the connect your device to iTunes. In the device overview in iTunes click on the "Restore" button WHILE holding the left shift button. You should be presented a explorer/finder window from where you can select the .ipsw. Just navigate to the save location and select it. Now your device should look the same as if you updated it. Just wait until it finishes and then you have iOS 8.4.1 back on yupour device.

Note, however, that you can't use any backups from iOS versions above 8.4.1, but that should'nt be a problem, just select your most recent backup (which should be from just before upgrading to iOS 9) and you should be up and running again with your old setup.

Thank you. It is helpful.

Note- I corrupted all the data on my iPad somehow going from 8.3 back to 8.2, had to restore completely. I wouldn't try downgrading. Wait for the developer to update the app.

Thank you for your suggestion. I have not done that yet.