Almanac is data that the GPS receiver receives from the satellites.

Cou cannot get the Almanac to "force read" to GPS receiver, it simply doesn't work that way.

I can only suggest

1. Leave car outside, under a clear sky, turn ignition on to Pos1, and wait at least 15min. Monitor the GPS receive signals in the Service Menu to watch the GPS signals being acquired.

It can easily take 5min to get the first GPS signal.

Check also the GPS Status and make sure that you don't see ANT OPEN or ANT SHORT or any bad error messages. "Searching" is OK, that's what it does when it looks for a satellite signal.

Only after the position has been calculated and the almanac has been downloaded, should you take the car for a calibration drive.