Some advice:

Before transferring any large amount of #bitcoin make sure you test the wallet.

Make sure to also note down the firmware version, and see if you can track down the file for that firmware version to keep safe.

Send a small amount, wipe the device, and restore it. Do this a couple times to be safe. Once you're happy you can reproduce the restoring successfully, then you can use it.

Personally, I'd go as far as wiping the device and re-flashing the firmware also.

Enjoy!