It turns out that the plane need to have the full IFR rectification done as it was past due. Somehow, I missed this fact during the pre-buy (it was clearly mentioned) Plus, the Garmins needed software updates as well. Ok, so it needs to be done. Gotta do it...
Anyway, to make a long story short, after a failed backup altimeter and shipments back and forth, along with endless software update for the EFIS, the plane was delivered back to the hanger yesterday. I hope to get back in the plane and fly it next week.