"This accessory may not be supported" error when using 30-pin reader with adapter

When using a TSS-PK8 (30-pin reader) with a 30-ping to Lightning adapter, you might receive an error that "This accessory may not be supported".  This is assumed to be a problem with newer devices (e.g. iPhone 7, iPad Pro) and how much power the device requires to work.

In some cases, simply clicking "Dismiss" will allow you to use the reader with Sub Rosa.

If the reader will not be recognized, please contact the Support Department at 


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macOS High Sierra Compatiblity

Update - December 28, 2017

PKard for Mac v1.7

PKard for Mac v1.7 works as expected with macOS High Sierra.

After upgrading to High Sierra, you may need to reinstall PKard for Mac.

We have compiled a short list of Common problems using PKard for Mac on High Sierra.

If you have any questions, please contact our Support Department.

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USB-C Adapter to Micro USB Adapter

If you have a phone that has a USB-C port, and you have not yet purchased a smart card reader, we recently began selling USB-C readers. You can purchase an Identiv USB-C Smart Card Reader from our online store.

If you have a phone that has a USB-C port, and you already have a Micro USB card reader, then we recommend that you use an adapter that has already been tested by Thursby Software. Here are some that have been tested in our office:

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Will this app work with Sub Rosa?

In order for you to use your smart card outside of the Sub Rosa, the app developers would need to have built their app using our SDK.  This means that the app in question will know to look to Sub Rosa for smart card credentials.  We recommend that you contact the app developers and inquire about Sub Rosa integration.

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First gen PKard Reader doesn't work with iPad using a lightning adapter.

The problem when connecting the TSS-PK6 reader to an iPad with iOS 8 or newer with a Lightning Adapter is that some communication data that is sent to the hardware when connected has changed.  This change is causing the hardware to reset.  This is why you likely see the error, "This accessory is not supported by this iPad" when you connect the reader with the adapter, even without our app installed.
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Unable to log into AROWS-R

As of 1/10/17, we received information from another reservist that AROWS-R is no longer available from public networks.  Please call or email the AROWS-R Help Desk if you require any additional information.


+1 877-294-5822

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Is there an extender or dongle to use with thick cases? (OtterBox, LifeProof, etc)

Thursby does not sell any extenders, dongles, or extension cables, but there are several types that can be used with thicker cases. Here are a few options that we have tried in-house and like (links to

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S/MIME controls are not available

Emails that have been signed and or encrypted will display the message "S/MIME controls are not available". This message means that when OWA tried to load its S/MIME plug-in that allows for signing, encrypted, and decrypting of emails, something went wrong and failed to load the plug-in. The only web browser that is capable of loading this plug-in is Internet Explorer on Windows. No other Windows or Mac web browser is capable of loading this plug-in, therefore you will not be able to sign, encrypt, or decrypt email.

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Why doesn't DTS work in Safari 10?

Apple recently published an update that included a new version of Safari this version includes a new way to allow Java to run in UnSafe Mode.  To turn off safe mode you will need to press and hold the Option key on your keyboard, click the drop down menu, and uncheck "Run in Safe Mode".  Once that has been unchecked, click done and close Safari Preferences.  At this point you can try the login process again, and you shouldn't see error code 305.

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