Foster,
What software version do have on your 987 at the moment and what version do have on the SD card?
Turn your unit on, restore to defaults and turn it off. Then turn it on again let it go through the start up sequence and then put the SD card in. The unit should recognize the newer version and ask you if you want to update. Answer with "yes" (right cursor button) and then the unit asks if you want to abort the update. Answer with "no" (left cursor button). The update should start then. Don't interupt the update process!
After the update the unit will restart automatically.
Turn it off and restart it again. Some guys restore to defaults again before they change the settings back to their preferences.
Hope this helps and thanks for the hint about xtremenavigation!
Regards / Harry