W52P/H upgrade handset doesn't work.

[tps]

Hello,
we have a problem upgrading a handset.
Version info :
base station hardware : 25.1.0.0.0.0.0
firmware : 25.73.0.20 (upgraded today)
handset hardware : 26.0.0.7
firmware : 26.40.188.1

Normally all conditions are met to do a upgrade of the handset via OTA as described in the upgrade manual. It doesnt work.

When i try to upgrade the handset via your upgrade tool and a usb cable i get the following message : OEM VERSION CHECK DISAFFINITY, SKIP UPGRADE.

Can you help me ???

Bye and thanks.