Thanks for your reply

I'm using Erminig-NG right now, but it doesn't work well.
-alarms don't synch from google. (time set to 0 on n900)
-events don't get copied to google if they have an alarm set on the n900.

So I remembered well ... I read that a few months ago.
As your second link says:

I recently restored my device or upgraded to a new device and Google sync is not working.
If you have recently deleted and then restored your device, this will count as a new connection and you will no longer be able to access Google Sync. If you have purchased a new device and tried to re-add Google Sync, this also counts as a new connection. Connections are based on devices and not accounts. If you have an iPad with an existing Google Sync connection and a new iPhone, the iPad will continue to work with Google Sync, but the iPhone will not be able to add the new account. Below you will find how to replace Google Sync on your device.